Stock and Stock Option Plans - Transactions for Stock Options (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Oct. 31, 2013	Jan. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, Outstanding at beginning balance	1,285,303
Number of shares, Granted	218,176
Number of shares, Exercised	(72,611)
Number of shares, Forfeited	(125,797)
Number of shares, Outstanding at ending balance	1,305,071
Number of shares, Exercisable	989,165	965,750
Weighted average exercise price, Outstanding at beginning balance	$ 25.97
Weighted average exercise price, Granted	$ 20.97
Weighted average exercise price, Exercised	$ 15.96
Weighted average exercise price, Forfeited	$ 28.67
Weighted average exercise price, Outstanding at ending balance	$ 25.43
Weighted average exercise price, Exercisable	$ 26.20	$ 25.95
Weighted average remaining contractual term, Outstanding at beginning balance	5 years 6 months
Weighted average remaining contractual term, Outstanding at ending balance	5 years 7 months 6 days
Weighted average remaining contractual term, Exercisable	4 years 7 months 6 days	4 years 6 months
Intrinsic value, Outstanding at beginning balance	$ 1,784
Intrinsic value, Outstanding at ending balance	566
Intrinsic value, Exercisable	$ 566	$ 1,710