Earnings Per Share - Reconciliation of Shares Used to Calculate Basic and Diluted Earnings Per Share (Detail)	3 Months Ended		9 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Class A Common Stock [Member]
Class of Stock [Line Items]
Basic shares	25,576,452	25,435,379	25,529,049	25,380,754
Assumed conversion of stock options	4,938	29,483	10,587	28,337
Diluted shares	25,581,390	25,464,862	25,539,636	25,409,091
Class B Common Stock [Member]
Class of Stock [Line Items]
Basic shares	22,119,966	22,119,966	22,119,966	22,119,966
Diluted shares	22,119,966	22,119,966	22,119,966	22,119,966
Basic and diluted shares	22,119,966	22,119,966	22,119,966	22,119,966