Warranties - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2019	Jun. 01, 2019
Product Warranty Liability [Line Items]
Warranty reserves	$ 0.3	$ 0.3
Minimum
Product Warranty Liability [Line Items]
Warranty term	1 year
Maximum
Product Warranty Liability [Line Items]
Warranty term	3 years