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Earnings Per Share - Reconciliation of Shares Used to Calculate Basic and Diluted Earnings Per Share (Detail)	3 Months Ended		6 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
Class A Common Stock [Member]
Class of Stock [Line Items]
Basic shares	25,390,486	25,149,691	25,353,441	25,101,280
Assumed conversion of stock options	43,699	141,404	40,962	134,423
Diluted shares	25,434,185	25,291,095	25,394,403	25,235,703
Class B Common Stock [Member]
Class of Stock [Line Items]
Basic shares	22,119,966	22,120,666	119,966	22,120,816
Diluted shares	22,119,966	22,120,666	119,966	22,120,816
Basic and diluted shares	22,119,966	22,120,666	22,119,966	22,120,816

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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