Subsequent Event (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 28, 2018	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Subsequent Event [Line Items]
Business acquisition, cash paid		$ 0	$ 0	$ 10,000
Subsequent Event
Subsequent Event [Line Items]
Business acquisition, cash paid	$ 3,000
Agreement to forego, accounts receivable balances	$ 1,200
Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Preferred stock shares issued, acquisitions (in shares)	152,290
Preferred stock issued, value	$ 3,500
Preferred stock, shares issued (in shares)	21,756
Preferred stock issued, value, contingent consideration	$ 500