Restatement of the Consolidated Financial Statements (Statements of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	$ 4,848	$ 31,796	$ 42,902
Depreciation	13,856	14,761	12,449
Amortization of intangible assets	3,280	2,608	1,746
Goodwill impairment loss	11,497	0	0
Long-lived asset impairment loss	3,826	0	0
Change in fair value of acquisition-related contingent consideration	(1,488)
Deferred income taxes	(6,039)	(958)	623
Change in operating assets and liabilities	9,888	7,973	(10,449)
Other operating activities, net	2,112	(996)	943
Net cash provided by operating activities	44,008	$ 60,083	$ 52,836
As Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	8,561
Depreciation	13,951
Amortization of intangible assets	3,658
Goodwill impairment loss	7,413
Long-lived asset impairment loss	0
Change in fair value of acquisition-related contingent consideration	(721)
Deferred income taxes	(3,021)
Change in operating assets and liabilities	9,847
Other operating activities, net	2,092
Net cash provided by operating activities	44,008
Restatement Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	(3,713)
Depreciation	(95)
Amortization of intangible assets	(378)
Goodwill impairment loss	4,084
Long-lived asset impairment loss	3,826
Change in fair value of acquisition-related contingent consideration	(767)
Deferred income taxes	(3,018)
Change in operating assets and liabilities	41
Other operating activities, net	20
Net cash provided by operating activities	$ 0