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Declaration of Dividend Payable	3 Months Ended
Declaration of Dividend Payable	Jul. 31, 2018
Text Block [Abstract]
Declaration of Dividend Payable	C. Declaration of Dividend Payable On May 16, 2018, our Board of Directors declared a quarterly cash dividend of $0.11 per share of our Class A and Class B common stock. The cash dividend is payable on August 31, 2018 to Class A and Class B shareholders of record at the close of business on August 17, 2018.