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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)
Jan. 31, 2015
Jul. 31, 2014
Class A nonvoting common stock    
Common stock, shares issued 51,261,487us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_NonvotingCommonStockMember
51,261,487us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_NonvotingCommonStockMember
Common stock, shares outstanding 47,748,984us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_NonvotingCommonStockMember
47,704,196us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_NonvotingCommonStockMember
Treasury stock, shares 3,512,503us-gaap_TreasuryStockShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_NonvotingCommonStockMember
3,477,291us-gaap_TreasuryStockShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_NonvotingCommonStockMember
Class B voting common stock    
Common stock, shares issued 3,538,628us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
3,538,628us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Common stock, shares outstanding 3,538,628us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
3,538,628us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember