Acquisition - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 25, 2015	Jan. 31, 2017	Jan. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 26,601	$ 26,601
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Business Acquisition [Line Items]
Business acquisition date	Jun. 25, 2015
Cash paid for business acquisition	$ 30,000
Intangible assets acquired	4,100
Goodwill	25,300
Net assets acquired	$ 600