Restricted cash (Notes)

6 Months Ended

Jul. 31, 2017

Restricted Cash and Cash Equivalents [Abstract]

Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]

Restricted cash. Restricted cash held by foreign subsidiaries was $0.9 million as of July 31, 2017 and January 31, 2017. Restricted cash held by foreign subsidiaries related to an escrow account from the sale of Nordic Air Filtration and fixed deposits that also serve as security deposits and guarantees.

	Six Months Ended July 31,
	2017		2016
Cash and cash equivalents		$8,546		$11,612
Restricted cash	893		942
Cash, cash equivalents and restricted cash shown in the statement of cashflows		$9,439		$12,554