Restricted cash (Notes)

9 Months Ended

Oct. 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 October 31, 2017 and $1.1 million as of 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.

	Nine Months Ended October 31,
	2017		2016
Cash and cash equivalents		$8,373		$9,008
Restricted cash	898		946
Cash, cash equivalents and restricted cash shown in the statement of cashflows		$9,271		$9,954