Discontinued operations Discontinued financials (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2017	Apr. 30, 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	$ 7,191
(Loss) gain on disposal of discontinued operations	0	867
Income (loss) from discontinued operations	0	(1,083)
(Loss) income from discontinued operations before income tax	0	(216)
Discontinued operation, income tax (benefit) expense	0	(16)
Loss from discontinued operations, net of tax	0	(200)
Disposal Group, Including Discontinued Operation, accounts receivable	0		$ 25
Disposal Group, Including Discontinued Operation, Assets	0		25
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities	201		199
Disposal Group, Including Discontinued Operation, Liabilities	201		$ 199
Net cash provided by (used in) discontinued operating activities	25	(1,408)
Net cash provided by (used in) discontinued investing activities	0	(1)
Net cash (used in) provided by discontinued financing activities	$ 0	$ 858