Line of Credit - Additional Information (Detail)	9 Months Ended	12 Months Ended
	Jul. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)	May 11, 2016 USD ($) instrument	Apr. 30, 2016 USD ($)
Line of Credit Facility
Syndicated line of credit, increased capacity	$ 800,000,000
Line of credit, maximum borrowing capacity	$ 1,000,000,000
Debt covenant leverage ratio	3.25
Minimum fixed charge coverage ratio	1.50
Consolidated net worth	$ 570,000,000
Consolidated net income earned	50.00%
Aggregate increases in stockholders' equity	100.00%
Covenants maximum leverage ratio	3.50
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from cash flow hedges, effect net of tax	$ 500,000	$ 100,000
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net	$ 200,000
Interest Rate Swap
Line of Credit Facility
Notional amount			$ 105,000,000	$ 155,000,000
Derivative, Number of Instruments Held | instrument			3
Derivative, fixed interest rate			1.05%
Minimum
Line of Credit Facility
Percentage of commitment fee on the unused portion of the Facility	0.20%
Maximum
Line of Credit Facility
Percentage of commitment fee on the unused portion of the Facility	0.275%
Base Rate | Minimum
Line of Credit Facility
Variable rate	0.00%
Base Rate | Maximum
Line of Credit Facility
Variable rate	0.75%
Eurodollar
Line of Credit Facility
Variable rate	1.00%
Eurodollar | Minimum
Line of Credit Facility
Variable rate	1.00%
Eurodollar | Maximum
Line of Credit Facility
Variable rate	1.75%
Federal Funds Rate
Line of Credit Facility
Variable rate	0.50%
Swing Line Loan
Line of Credit Facility
Line of credit, maximum borrowing capacity	$ 50,000,000
Standby Letters of Credit
Line of Credit Facility
Line of credit, maximum borrowing capacity	$ 300,000,000