Warranty (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2013	Jan. 31, 2021	Jan. 31, 2020
Warranty [Line Items]
Product warranty period	10 years
Warranty claim activity
Beginning accrued warranty balance		$ 800	$ 700
Provision		380	570
Benefits from prior years		(325)	(145)
Costs incurred		(155)	(325)
Ending accrued warranty balance		$ 700	$ 800
Minimum [Member]
Warranty [Line Items]
Product warranty period		10 years
Maximum [Member]
Warranty [Line Items]
Product warranty period		10 years