Auction Rate Securities - Additional Information (Detail)		3 Months Ended	12 Months Ended
	Mar. 03, 2016 USD ($)	Jan. 31, 2016 USD ($) institution	Oct. 31, 2015 USD ($) institution
Schedule of Available-for-sale Securities
Number of financial institution | institution		3	3
Interest rate reset interval		30 days
Auction rate security at fair value		$ 5,000,000
Auction Rate Securities
Schedule of Available-for-sale Securities
Debt securities		15,000,000	$ 15,000,000
Amortized cost basis		13,000,000	13,000,000
Unrealized holding gain (loss) on securities		0	0
Auction Rate Securities | Retained Earnings
Schedule of Available-for-sale Securities
Total amount of other-than-temporary impairment (OTTI) credit loss recognized		$ 2,000,000	$ 2,000,000
Subsequent Event
Schedule of Available-for-sale Securities
Auction rate securities	$ 5,000,000
Auction rate security at fair value	5,000,000
Subsequent Event | Auction Rate Securities
Schedule of Available-for-sale Securities
Gross unrealized gain (loss)	$ 0