Restatement of the Unaudited Consolidated Financial Statements (Cash Flows Restatement) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	$ (6,166)	$ 6,797	$ 2,916	$ 25,578
Change in fair value of acquisition-related contingent consideration			(1,720)	514
Goodwill impairment loss	11,497	0	11,497	0
Long-lived asset impairment loss	3,813	$ 0	3,813	0
Deferred income taxes			(6,685)	(2,420)
Change in inventories			4,820	2,768
Operating liabilities			(12,580)	1,623
Net cash provided by operating activities			35,181	$ 45,695
As Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	(1,559)		7,523
Change in fair value of acquisition-related contingent consideration			(930)
Goodwill impairment loss	7,413		7,413
Long-lived asset impairment loss	0		0
Deferred income taxes			(4,765)
Change in inventories			4,832
Operating liabilities			(12,012)
Net cash provided by operating activities			35,181
Restatement Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	(4,607)		(4,607)
Change in fair value of acquisition-related contingent consideration			(790)
Goodwill impairment loss	4,084		4,084
Long-lived asset impairment loss	$ 3,813		3,813
Deferred income taxes			(1,920)
Change in inventories			(12)
Operating liabilities			(568)
Net cash provided by operating activities			$ 0