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It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For 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 months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents.","units":{"USD":[{"end":"2016-05-01","val":259040,"accn":"0001213900-18-003157","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-03-19","frame":"CY2016Q1I"},{"end":"2017-01-31","val":184433,"accn":"0001213900-18-003157","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-03-19","frame":"CY2016Q4I"},{"end":"2017-04-30","val":148119,"accn":"0001213900-18-003157","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-03-19"},{"end":"2017-04-30","val":148119,"accn":"0001213900-18-010267","fy":2018,"fp":"FY","form":"10-K","filed":"2018-08-06"},{"end":"2017-04-30","val":148119,"accn":"0001213900-18-012543","fy":2019,"fp":"Q1","form":"10-Q","filed":"2018-09-14","frame":"CY2017Q1I"},{"end":"2017-07-31","val":103457,"accn":"0001213900-18-012543","fy":2019,"fp":"Q1","form":"10-Q","filed":"2018-09-14","frame":"CY2017Q2I"}]}},"CashAndCashEquivalentsPeriodIncreaseDecrease":{"label":"Cash and Cash Equivalents, Period Increase (Decrease)","description":"Amount of increase (decrease) in cash and cash equivalents. 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Average Number of Shares Issued, Basic","description":"This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic).","units":{"shares":[{"start":"2016-05-02","end":"2016-10-31","val":66429868,"accn":"0001213900-18-000324","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-01-10"},{"start":"2016-08-01","end":"2016-10-31","val":66429868,"accn":"0001213900-18-000324","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-01-10","frame":"CY2016Q3"},{"start":"2017-05-01","end":"2017-10-31","val":70929868,"accn":"0001213900-18-000324","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-01-10"},{"start":"2017-08-01","end":"2017-10-31","val":70929868,"accn":"0001213900-18-000324","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-01-10","frame":"CY2017Q3"}]}},"WeightedAverageNumberOfSharesOutstandingBasic":{"label":"Weighted Average Number of Shares Outstanding, Basic","description":"Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.","units":{"shares":[{"start":"2016-05-02","end":"2017-01-31","val":67362839,"accn":"0001213900-18-003157","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-03-19"},{"start":"2016-11-01","end":"2017-01-31","val":68929868,"accn":"0001213900-18-003157","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-03-19","frame":"CY2016Q4"},{"start":"2017-05-01","end":"2018-01-31","val":76734423,"accn":"0001213900-18-003157","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-03-19"},{"start":"2017-11-01","end":"2018-01-31","val":88343532,"accn":"0001213900-18-003157","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-03-19","frame":"CY2017Q4"}]}}}}}