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Net Income per Common Share - Additional Informations (Detail) (Class A nonvoting common stock) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2015 | Jan. 31, 2014
Class A nonvoting common stock |  |  |  |
Earnings Per Share [Line Items] |  |  |  |
Common stock of Class A shares excluded from computations of diluted net income per share | 3,860 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_StatementClassOfStockAxis = us-gaap_NonvotingCommonStockMember | 2,537 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_StatementClassOfStockAxis = us-gaap_NonvotingCommonStockMember | 3,878 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_StatementClassOfStockAxis = us-gaap_NonvotingCommonStockMember | 2,521 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_StatementClassOfStockAxis = us-gaap_NonvotingCommonStockMember

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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