Income Taxes - Reconciliation of Expected to Actual Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Reconciliation of expected to actual income tax expense
Federal income tax (benefit) expense at 34%									$ (9,436)	$ (3,463)	$ 2,049
Changes in tax rates									(82)		22
Permanent differences									509	(224)	132
Foreign effective tax rate differential									1,609	540	(1,884)
Potential tax, penalties and interest resulting from uncertain tax positions									(236)	(172)	32
Foreign withholding taxes									717	920	642
Election to deduct foreign taxes in prior years U.S. income tax returns									2,610
Valuation allowance on deferred tax assets									15,477	1,379
Other									(191)	26	265
Income tax expense (benefit)	$ 14,675	$ (746)	$ (2,797)	$ (155)	$ (1,484)	$ 57	$ (676)	$ 1,109	$ 10,977	$ (994)	$ 1,258