Income Taxes - Additional Information (Details) $ in Thousands	3 Months Ended
	Apr. 30, 2016 USD ($)
Income Tax Disclosure [Abstract]
Unrecognized tax benefits related to uncertain income tax positions	$ 980
Unrecognized tax benefits related to uncertain income tax position accrued interest and penalties	371
Recognized liabilities for unrecognized tax benefits that impact effective tax rate	732
Gross unrecognized tax benefits decrease for uncertain tax positions	112
Approximate gross unrecognized tax benefit that would impact the effective tax rate	$ 83