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Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.","units":{"shares":[{"end":"2011-07-31","val":13957134,"accn":"0001085706-11-000016","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-09-08","frame":"CY2011Q2I"},{"end":"2011-10-31","val":14071419,"accn":"0001085706-11-000026","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-09","frame":"CY2011Q3I"},{"end":"2012-02-29","val":14126706,"accn":"0001085706-12-000009","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14"},{"end":"2012-04-30","val":14127739,"accn":"0001085706-12-000020","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-10","frame":"CY2012Q1I"},{"end":"2012-07-31","val":14129068,"accn":"0001085706-12-000031","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-09","frame":"CY2012Q2I"},{"end":"2012-10-31","val":14129378,"accn":"0001085706-12-000042","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-09","frame":"CY2012Q3I"},{"end":"2013-02-28","val":14132065,"accn":"0001085706-13-000009","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15"},{"end":"2013-04-30","val":14136018,"accn":"0001085706-13-000016","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-10","frame":"CY2013Q1I"},{"end":"2013-07-31","val":14144555,"accn":"0001085706-13-000025","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-09","frame":"CY2013Q2I"},{"end":"2013-10-31","val":14155303,"accn":"0001085706-13-000031","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-12","frame":"CY2013Q3I"},{"end":"2014-02-28","val":14162521,"accn":"0001085706-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17"},{"end":"2014-04-30","val":14179223,"accn":"0001085706-14-000013","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-09","frame":"CY2014Q1I"},{"end":"2014-07-31","val":14200176,"accn":"0001085706-14-000022","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-11","frame":"CY2014Q2I"},{"end":"2014-10-31","val":14206703,"accn":"0001085706-14-000033","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-10","frame":"CY2014Q3I"},{"end":"2015-02-28","val":14268772,"accn":"0001085706-15-000013","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16"},{"end":"2015-04-30","val":14165110,"accn":"0001085706-15-000022","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-11","frame":"CY2015Q1I"},{"end":"2015-07-31","val":14027516,"accn":"0001085706-15-000039","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-10","frame":"CY2015Q2I"},{"end":"2015-10-31","val":14162138,"accn":"0001085706-15-000052","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-09","frame":"CY2015Q3I"}]}},"EntityPublicFloat":{"label":"Entity Public Float","description":"The aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant's most recently completed second fiscal quarter.","units":{"USD":[{"end":"2011-06-30","val":145614067000,"accn":"0001085706-12-000009","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-14","frame":"CY2011Q2I"},{"end":"2012-06-30","val":155594360,"accn":"0001085706-13-000009","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-15","frame":"CY2012Q2I"},{"end":"2013-06-30","val":260513405,"accn":"0001085706-14-000007","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17","frame":"CY2013Q2I"},{"end":"2014-06-30","val":301818491,"accn":"0001085706-15-000013","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2014Q2I"}]}}},"us-gaap":{"AccretionAmortizationOfDiscountsAndPremiumsInvestments":{"label":"Accretion (Amortization) of Discounts and Premiums, Investments","description":"The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. 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Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. 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Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred 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Such item represents the gross unrecognized holding 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