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Earnings Per Share - Reconciliation of Shares Used to Calculate Basic and Diluted Earnings Per Share (Detail) | 3 Months Ended | 12 Months Ended
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Oct. 31, 2014 | Jul. 31, 2014 | Apr. 30, 2014 | Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2012
Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basic shares | 25,603,452 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,576,452 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,540,341 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,470,354 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,454,762 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,435,379 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,390,486 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,316,395 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,547,650 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,399,256 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,162,686 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Assumed conversion of stock options |  |  |  |  |  |  |  |  | 5,336 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 23,066 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 70,170 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Diluted shares | 25,554,934 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,581,952 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,560,846 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,495,642 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,473,695 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,464,664 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,432,388 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,380,502 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,552,986 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,422,322 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 25,232,856 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Class B Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basic shares | 22,119,966 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,119,966 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,119,966 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,119,966 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,119,966 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,119,966 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,119,966 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,119,966 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,100,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,100,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,100,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Diluted shares | 22,119,966 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,119,966 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,119,966 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,119,966 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,119,966 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,119,966 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,119,966 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,119,966 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,100,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,100,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,100,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Basic and diluted shares |  |  |  |  |  |  |  |  | 22,119,966 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,119,966 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 22,120,391 us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember

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