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Cash Dividends	9 Months Ended
Cash Dividends	Jan. 31, 2014
Cash Dividends [Abstract]
Cash Dividends Disclosure [Text Block]	Cash Dividends Cash dividends declared and paid on Class A and Class B common stock during the nine months ended January 31, 2013, included a special cash dividend of $4.00 per share in addition to regular quarterly cash dividends.