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Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"start":"2018-06-01","end":"2019-05-31","val":-1628448,"accn":"0001213900-20-022549","fy":2020,"fp":"FY","form":"10-K","filed":"2020-08-17"},{"start":"2018-06-01","end":"2019-05-31","val":-1628448,"accn":"0001213900-20-028572","fy":2020,"fp":"FY","form":"10-K/A","filed":"2020-09-28","frame":"CY2018"},{"start":"2019-06-01","end":"2020-05-31","val":6035033,"accn":"0001213900-20-022549","fy":2020,"fp":"FY","form":"10-K","filed":"2020-08-17"},{"start":"2019-06-01","end":"2020-05-31","val":6035033,"accn":"0001213900-20-028572","fy":2020,"fp":"FY","form":"10-K/A","filed":"2020-09-28","frame":"CY2019"},{"start":"2022-06-01","end":"2022-11-30","val":1201629,"accn":"0001213900-24-003017","fy":2023,"fp":"Q2","form":"10-Q","filed":"2024-01-11"},{"start":"2023-06-01","end":"2023-11-30","val":1696960,"accn":"0001213900-24-003017","fy":2023,"fp":"Q2","form":"10-Q","filed":"2024-01-11"}]}},"CashEquivalentsAtCarryingValue":{"label":"Cash Equivalents, at Carrying Value","description":"Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.","units":{"USD":[{"end":"2020-05-31","val":9730022,"accn":"0001213900-21-044375","fy":2021,"fp":"FY","form":"10-K","filed":"2021-08-23","frame":"CY2020Q2I"},{"end":"2021-05-31","val":7370646,"accn":"0001213900-21-044375","fy":2021,"fp":"FY","form":"10-K","filed":"2021-08-23"},{"end":"2021-05-31","val":7370646,"accn":"0001213900-21-052655","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-10-13"},{"end":"2021-05-31","val":7370646,"accn":"0001213900-22-001405","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-01-10"},{"end":"2021-05-31","val":7370646,"accn":"0001213900-22-019223","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-04-11"},{"end":"2021-05-31","val":7370646,"accn":"0001213900-22-048182","fy":2022,"fp":"FY","form":"10-K","filed":"2022-08-15"},{"end":"2021-05-31","val":6490158,"accn":"0001213900-23-001829","fy":2022,"fp":"Q2","form":"10-Q","filed":"2023-01-10","frame":"CY2021Q2I"},{"end":"2021-08-31","val":7605942,"accn":"0001213900-21-052655","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-10-13","frame":"CY2021Q3I"},{"end":"2021-11-30","val":6267810,"accn":"0001213900-22-001405","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-01-10","frame":"CY2021Q4I"},{"end":"2022-02-28","val":6486205,"accn":"0001213900-22-019223","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-04-11","frame":"CY2022Q1I"},{"end":"2022-05-31","val":6490158,"accn":"0001213900-22-048182","fy":2022,"fp":"FY","form":"10-K","filed":"2022-08-15"},{"end":"2022-05-31","val":6490158,"accn":"0001213900-22-062991","fy":2023,"fp":"Q1","form":"10-Q","filed":"2022-10-11"},{"end":"2022-05-31","val":6490158,"accn":"0001213900-23-028694","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-04-11"},{"end":"2022-05-31","val":6490158,"accn":"0001213900-23-066312","fy":2023,"fp":"FY","form":"10-K","filed":"2023-08-11","frame":"CY2022Q2I"},{"end":"2022-08-31","val":7749286,"accn":"0001213900-22-062991","fy":2023,"fp":"Q1","form":"10-Q","filed":"2022-10-11","frame":"CY2022Q3I"},{"end":"2022-11-30","val":7691787,"accn":"0001213900-23-001829","fy":2022,"fp":"Q2","form":"10-Q","filed":"2023-01-10","frame":"CY2022Q4I"},{"end":"2023-02-28","val":7569577,"accn":"0001213900-23-028694","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-04-11","frame":"CY2023Q1I"},{"end":"2023-05-31","val":7382320,"accn":"0001213900-23-066312","fy":2023,"fp":"FY","form":"10-K","filed":"2023-08-11"},{"end":"2023-05-31","val":7382320,"accn":"0001013762-23-003252","fy":2024,"fp":"Q1","form":"10-Q","filed":"2023-10-11","frame":"CY2023Q2I"},{"end":"2023-08-31","val":7694031,"accn":"0001013762-23-003252","fy":2024,"fp":"Q1","form":"10-Q","filed":"2023-10-11","frame":"CY2023Q3I"}]}},"CertificatesOfDepositAtCarryingValue":{"label":"Certificates of Deposit, at Carrying Value","description":"A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three 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Stock, Dividends, Per Share, Cash Paid","description":"Aggregate dividends paid during the period for each share of common stock outstanding.","units":{"USD/shares":[{"start":"2012-06-01","end":"2012-11-30","val":1.5,"accn":"0001213900-14-000154","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-01-10"},{"start":"2012-06-01","end":"2012-11-30","val":1.5,"accn":"0001213900-13-000106","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-01-09"},{"start":"2012-11-01","end":"2012-11-30","val":1.5,"accn":"0001213900-13-001694","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-04-08"},{"start":"2012-11-28","end":"2012-11-30","val":1.5,"accn":"0001213900-14-002307","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-04-10"},{"start":"2012-11-29","end":"2012-11-30","val":1.5,"accn":"0001213900-14-005350","fy":2014,"fp":"FY","form":"10-K","filed":"2014-08-04"},{"start":"2012-11-29","end":"2012-11-30","val":1.5,"accn":"0001213900-13-004066","fy":2013,"fp":"FY","form":"10-K","filed":"2013-08-08"}]}},"CommonStockParOrStatedValuePerShare":{"label":"Common Stock, Par or Stated Value Per Share","description":"Face amount or stated value 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