Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Income Tax Disclosure [Abstract]
Federal income tax expense	32.90%	34.00%	34.00%
Decrease in deferred income tax assets	$ 7,000,000
Repatriation of foreign earnings	11,200,000
Recognized deferred tax liability related to undistributed earnings	0
Deferred tax assets	1,381,000	$ 2,259,000
Valuation allowance, deferred tax assets	21,154,000	26,357,000
Tax credit carry forwards	$ 693,000
Tax credit carry forwards expiration year	2021
Increase (decrease) in uncertain tax positions			$ (92,000)
Potential penalties and interest		145,000
Excess tax deficiency for share-based payments under ASU 2016-09	$ 309,000	$ 0	$ 0