Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Jul. 31, 2015	Jul. 31, 2015	Jan. 31, 2015
Income Tax Disclosure [Abstract]
Prepaid income taxes	$ 1,691,000	$ 1,691,000	$ 1,018,000
Prepaid foreign taxes	1,600,000	1,600,000	900,000
Prepaid domestic federal and state taxes	100,000	100,000	$ 100,000
Deferred tax asset	$ 110,000	$ 235,000
Federal statutory rate	34.00%	34.00%
Recognized tax benefits	$ 92,000	$ 92,000
Reversed potential penalties and interest	$ 144,000