Change in Allowance for Doubtful Accounts (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Oct. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning Balance	$ 4,432
Charged to expense	285
Deductions	(146)	[1]
Ending Balance	$ 4,571

[1] Specific account write-offs and foreign exchange.