Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015
Deferred Tax Assets:
Accruals and reserves	$ 8,181	$ 4,974
Net operating loss carryforward	1,834	1,176
State income taxes	1,097	967
Tax credit carryforward	10,346	1,795
Other		521
Gross Deferred Tax Assets	21,458	9,433
Valuation Allowance	(7,990)	(2,304)
Total Deferred Tax Assets	13,468	7,129
Deferred Tax Liabilities:
Property and equipment	(1,265)	(193)
Intangible assets	(12,854)	(1,822)
Expensed internal-use software	(371)	(469)
Other	(241)
Total Deferred Tax Liabilities	(14,731)	(2,484)
Net Deferred Tax (Liability)	$ (1,263)
Net Deferred Tax Assets		$ 4,645