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Subsequent Event (Notes)	6 Months Ended
Subsequent Event (Notes)	Oct. 31, 2013
Subsequent Event [Abstract]
Subsequent Event	Subsequent Event As announced on November 21, 2013, our Board of Directors increased our quarterly cash dividend on Class A and Class B common stock from $0.255 per share to $0.29 per share. Stockholders of record on December 4, 2013, will receive the cash dividend on December 27, 2013.