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Revenue from Contracts with Customers Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2017
Disaggregation of Revenue [Line Items]
Contract with Customer, Asset, Net	$ 0									$ 0
Contract with Customer, Right to Recover Product	1,962									1,962
Revenue from Contract with Customer, Excluding Assessed Tax	$ 107,457	$ 129,637	$ 108,867	$ 100,855	$ 122,236	$ 156,563	$ 113,470	$ 114,823	$ 514,530	446,816	$ 507,092	$ 514,530
Corporate, Non-Segment [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									796	927	450	796
Automotive [Member] \| Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									170,729	161,647	155,480	170,729
Automotive [Member] \| Operating Segments [Member] \| OEM [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										90,844	77,902	88,999
Automotive [Member] \| Operating Segments [Member] \| aftermarket [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										70,803	77,578	81,730
Premium Audio [Member] \| Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									166,789	158,436	172,406	166,789
Premium Audio [Member] \| Operating Segments [Member] \| commercial customer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										5,313	5,812	10,017
Premium Audio [Member] \| Operating Segments [Member] \| retail customer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										153,123	166,594	156,772
Consumer Accessories [Member] \| Operating Segments [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 176,216	$ 125,806	$ 178,756	$ 176,216