Discontinued operations Discontinued financials (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016	Jan. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue	$ 0	$ 3,276	$ 0	$ 10,467
Gain on disposal of discontinued operations	0	1,605	0	2,472
Income (loss) from discontinued operations	0	423	0	(660)
Income from discontinued operations before income tax	0	2,028	0	1,812
Discontinued operation, income tax expense	0	719	0	703
Income from discontinued operations, net of tax	0	$ 1,309	0	1,109
Disposal Group, Including Discontinued Operation, accounts receivable	0		0		$ 25
Disposal Group, Including Discontinued Operation, Assets	0		0		25
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities	156		156		199
Disposal Group, Including Discontinued Operation, Liabilities	$ 156		156		$ 199
Net cash used in discontinued operating activities			(18)	(208)
Net cash provided by discontinued investing activities			0	7,574
Net cash used in discontinued financing activities			$ 0	$ (7,365)