Changes in Allowance for Doubtful Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Oct. 31, 2012		Oct. 31, 2011		Oct. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at Beginning of Period	$ 2,489		$ 2,727		$ 3,587
Provisions	3,754		1,058		(899)
Write-offs	(171)	[1]	(1,296)	[1]	39	[1]
Balance at End of Period	$ 6,072		$ 2,489		$ 2,727

[1] Balances written off, net of recoveries.