Income Taxes - Reconciliation of Expected to Actual Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Reconciliation of expected to actual income tax expense
Federal income tax at 21%, 32.9%, 34%, respectively									$ (4,113)	$ (6,632)	$ (10,655)
Federal income tax rate									21.00%	32.90%	34.00%
Changes in tax rates									$ 0	$ 7,257	$ 0
Permanent differences									(148)	3,356	38
Foreign effective tax rate differential									60	1,163	1,979
Foreign withholding taxes, foreign branch taxes, including penalties and interest									431	716	671
Tax effect of book loss on disposition of subsidiaries									1,271	0	0
Valuation allowance on deferred tax assets									2,249	(5,765)	10,056
Excess tax deficiency for share-based payments under ASU 2016-09									663	309	0
Other									(161)	506	(275)
Income tax expense	$ (21)	$ (249)	$ 85	$ 437	$ (262)	$ 586	$ 357	$ 229	$ 252	$ 910	$ 1,814