Income Taxes - Components of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Current provision:
Federal	$ 26,919	$ 26,039	$ 13,837
State	2,897	3,022	1,186
Foreign	826	2,093	1,644
Total	30,642	31,154	16,667
Deferred provision:
Federal	(4,573)	(3,421)	(1,360)
State	(209)	(197)	(94)
Foreign	(1,703)	(733)	(328)
Total	(6,485)	(4,351)	(1,782)
Provision for income taxes	$ 24,157	$ 26,803	$ 14,885