Earnings Per Share - Reconciliation of Shares Used to Calculate Basic and Diluted Earnings Per Share (Detail) - shares	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Class A Common Stock
Class of Stock [Line Items]
Basic shares (shares)	25,781,146	25,692,973	25,746,797	25,659,750
Assumed conversion of stock options (shares)	2,038	5,574	349	5,574
Diluted shares (shares)	25,783,184	25,698,547	25,747,146	25,665,324
Class B Common Stock
Class of Stock [Line Items]
Basic shares (shares)	22,000,000	22,100,000	22,100,000	22,100,000
Diluted shares (shares)	22,000,000	22,100,000	22,100,000	22,100,000
Basic and diluted shares (shares)	22,009,725	22,119,966	22,079,544	22,119,966