Auction Rate Securities - Additional Information (Detail) (Auction rate securities, USD $) In Millions, unless otherwise specified	9 Months Ended
	Jul. 31, 2014 Entity	Jul. 31, 2014 Retained Earnings	Oct. 31, 2013 Retained Earnings
Schedule of Available-for-sale Securities
Number of different issuers the company held investments in for auction rate securities	3
Investments in auction rate securities	$ 15.0
Interest rate revising interval	30 days
Total amount of other-than-temporary impairment (OTTI) credit loss recognized		$ 2.0	$ 2.0