PURCHASED INTANGIBLE ASSETS - Intangible Assets Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Activity related to intangible assets, excluding goodwill
Intangible assets, beginning of year	$ 11,854	$ 3,824
Intangible assets, end of year	11,854	11,854	$ 3,824
Accumulated amortization, beginning of year	2,510	1,979
Amortization expense	1,163	531	243
Accumulated amortization, end of year	3,673	2,510	$ 1,979
Intangible assets, net	$ 8,181	9,344
APC
Activity related to intangible assets, excluding goodwill
Addition		543
TRC
Activity related to intangible assets, excluding goodwill
Addition		$ 7,487