Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014	Jan. 31, 2016	Jan. 31, 2015
Income Taxes [Line Items]
Income tax expense	$ 7,204	$ 3,849	$ 9,763	$ 1,907
Effective tax rate	34.20%	15.80%	22.30%	5.70%
Period specific items benefit			$ (301)
U.S. federal statutory rate			35.00%
Income taxes associated with uncertain income tax positions	$ 22,294		$ 22,294
Liability for uncertain tax positions, current	1,612		1,612
Income tax liability	$ 20,682		$ 20,682			$ 19,279
Scenario, Forecast [Member]
Income Taxes [Line Items]
Effective income tax rate forecast					23.00%