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Description of Business and Summary of Significant Accounting Policies Revenue Recognition (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
Contract with Customer, Liability	$ 0									$ 0
Revenue, Remaining Performance Obligation, Amount	0									0
Cost of Goods and Services Sold									$ 370,500	325,399	$ 374,795
Contract with Customer, Refund Liability	4,415				$ 0					4,415	0
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]
Revenue from Contract with Customer, Excluding Assessed Tax									796	927	450	796
Automotive [Member] \| Operating Segments [Member]
Revenue from Contract with Customer, Excluding Assessed Tax									170,729	161,647	155,480	170,729
Premium Audio [Member] \| Operating Segments [Member]
Revenue from Contract with Customer, Excluding Assessed Tax									166,789	158,436	172,406	166,789
Consumer Accessories [Member] \| Operating Segments [Member]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 176,216	125,806	178,756	176,216
commercial customer [Member] \| Premium Audio [Member] \| Operating Segments [Member]
Revenue from Contract with Customer, Excluding Assessed Tax										5,313	5,812	10,017
retail customer [Member] \| Premium Audio [Member] \| Operating Segments [Member]
Revenue from Contract with Customer, Excluding Assessed Tax										153,123	166,594	156,772
aftermarket [Member] \| Automotive [Member] \| Operating Segments [Member]
Revenue from Contract with Customer, Excluding Assessed Tax										70,803	77,578	81,730
OEM [Member] \| Automotive [Member] \| Operating Segments [Member]
Revenue from Contract with Customer, Excluding Assessed Tax										$ 90,844	$ 77,902	$ 88,999