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Subsequent Event	3 Months Ended
Subsequent Event	Jul. 31, 2018
Subsequent Events [Abstract]
Subsequent Event	K. Subsequent Event On August 22, 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 December 5, 2018 to Class A and Class B shareholders of record at the close of business on November 19, 2018.