Restatement of the Unaudited Consolidated Financial Statements (Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	$ 5,519	$ 4,861
Depreciation and amortization	3,762	4,363
Change in fair value of acquisition-related contingent consideration	63	212
Deferred income taxes	1,651	110
Operating liabilities	4,427	(4,105)
Net cash provided by operating activities	11,104	$ 9,023
As Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	5,525
Depreciation and amortization	4,186
Change in fair value of acquisition-related contingent consideration	82
Deferred income taxes	1,554
Operating liabilities	4,075
Net cash provided by operating activities	11,104
Restatement Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	(6)
Depreciation and amortization	(424)
Change in fair value of acquisition-related contingent consideration	(19)
Deferred income taxes	97
Operating liabilities	352
Net cash provided by operating activities	$ 0