Schedule II - Schedule of Valuation and Qualifying Accounts - Schedule of Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Allowance for Bad Debt [Member]
Balance at beginning of period	$ 1,090	$ 1,242	$ 1,194
Charged to statements of income	98	40	78
Write-offs, net of recoveries	(834)	(184)	(5)
Impact of foreign currency translation	(42)	(8)	(25)
Balance at end of period	396	1,090	1,242
Impact of foreign currency translation	42	8	25
Allowance for Sales Returns [Member]
Balance at beginning of period	1,115	1,400	1,330
Charged to statements of income	923	197	696
Write-offs, net of recoveries	(733)	(472)	(555)
Impact of foreign currency translation	(62)	(10)	(71)
Balance at end of period	1,367	1,115	1,400
Impact of foreign currency translation	62	10	71
Allowance for Doubtful Accounts [Member]
Balance at beginning of period	2,205	2,642	2,524
Charged to statements of income	1,021	237	774
Write-offs, net of recoveries	(1,567)	(656)	(560)
Impact of foreign currency translation	(104)	(18)	(96)
Balance at end of period	1,763	2,205	2,642
Impact of foreign currency translation	$ 104	$ 18	$ 96