Earnings Per Share - Reconciliation of Shares Used to Calculate Basic and Diluted Earnings Per Share (Detail) - shares	3 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
Class A Common Stock
Class of Stock [Line Items]
Basic shares (shares)	25,845,758	25,787,769
Assumed conversion of restricted shares (shares)	0	4,672
Diluted shares (shares)	25,845,758	25,792,441
Class B Common Stock
Class of Stock [Line Items]
Basic shares (shares)	22,000,000	22,000,000
Diluted shares (shares)	22,000,000	22,000,000
Basic and diluted shares (shares)	22,007,725	22,009,725