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Condensed Consolidated Statements of Operations (Parenthetical) (USD $)
 3 Months Ended 9 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2015
Jan. 31, 2014
Diluted $ 0.10us-gaap_EarningsPerShareDiluted [1] $ 0.09us-gaap_EarningsPerShareDiluted [1] $ 0.19us-gaap_EarningsPerShareDiluted [1] $ 0.28us-gaap_EarningsPerShareDiluted [1]
Class B Common Shares        
Diluted $ 0.10us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 0.09us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 0.20us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 0.28us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
[1] Basic per share amounts are the same for Class A and Class B shares. Diluted per share amounts for Class A shares are shown above. Diluted earnings per share for Class B shares under the two-class method are $0.10 and $0.09 for the three months ended January 31, 2015 and 2014 and $0.20 and $0.28 for the nine months ended January 31, 2015 and 2014, respectively. See Note D to the Condensed Consolidated Financial Statements.