Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Amounts Charged (Credited) to Expense	$ 21	$ 9
Deductions From Allowance	(21)	(9)
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	409	254	12,915
Amounts Charged (Credited) to Expense	(104)	155	(12,501)
Deductions From Allowance			(160)
Balance at End of Period	$ 305	$ 409	$ 254