Earnings Per Share - Reconciliation of Shares Used to Calculate Basic and Diluted Earnings Per Share (Detail) - shares	3 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Class A Common Stock
Class of Stock [Line Items]
Basic shares (shares)	25,787,769	25,697,512
Assumed conversion of stock options (shares)	4,672	6,511
Diluted shares (shares)	25,792,441	25,704,023
Class B Common Stock
Class of Stock [Line Items]
Basic shares (shares)	22,000,000	22,100,000
Diluted shares (shares)	22,000,000	22,100,000
Basic and diluted shares (shares)	22,009,725	22,119,966