Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016	Apr. 18, 2017	Feb. 28, 2017
Goodwill and Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 6,399		$ 6,399
Goodwill	53,916		53,916		$ 10	$ 53,905
Finite-Lived Intangible Assets, Gross	88,091		88,091			87,006
Finite-Lived Intangible Assets, Accumulated Amortization	35,962		35,962			32,153
Finite-Lived Intangible Assets, Net	52,129		52,129			54,853
Intangible Assets, Net (Excluding Goodwill)	153,403		153,403			154,939
Depreciation and amortization	1,642	$ 1,620	3,255	$ 3,240
Finite-Lived Intangible Assets, Amortization Expense, Year Two	6,281		6,281
Finite-Lived Intangible Assets, Amortization Expense, Year Three	6,228		6,228
Finite-Lived Intangible Assets, Amortization Expense, Year Four	6,003		6,003
Finite-Lived Intangible Assets, Amortization Expense, Year Five	5,874		5,874
Customer Relationships [Member]
Goodwill and Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	50,033		50,033			49,005
Finite-Lived Intangible Assets, Accumulated Amortization	24,885		24,885			22,615
Finite-Lived Intangible Assets, Net	25,148		25,148			26,390
Trademarks and Tradenames [Member]
Goodwill and Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	415		415			415
Finite-Lived Intangible Assets, Accumulated Amortization	397		397			395
Finite-Lived Intangible Assets, Net	18		18			20
Patented Technology [Member]
Goodwill and Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	31,290		31,290			31,290
Finite-Lived Intangible Assets, Accumulated Amortization	5,442		5,442			4,081
Finite-Lived Intangible Assets, Net	25,848		25,848			27,209
Patents [Member]
Goodwill and Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	2,812		2,812			2,755
Finite-Lived Intangible Assets, Accumulated Amortization	2,048		2,048			1,930
Finite-Lived Intangible Assets, Net	764		764			825
Licensing Agreements [Member]
Goodwill and Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,400		1,400			1,400
Finite-Lived Intangible Assets, Accumulated Amortization	1,400		1,400			1,400
Finite-Lived Intangible Assets, Net	0		0			0
Contractual Rights [Member]
Goodwill and Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	2,141		2,141			2,141
Finite-Lived Intangible Assets, Accumulated Amortization	1,790		1,790			1,732
Finite-Lived Intangible Assets, Net	351		351			409
Trademarks [Member]
Goodwill and Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	101,274		101,274			100,086
Automotive [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill	7,383		7,383			7,373
Goodwill, Acquired During Period			10
Goodwill, Gross	7,383		7,383
Goodwill, Impaired, Accumulated Impairment Loss	0		0
Premium Audio [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill	46,533		46,533			$ 46,533
Goodwill, Gross	78,696		78,696
Goodwill, Impaired, Accumulated Impairment Loss	$ (32,163)		(32,163)
Goodwill, Other Changes			$ 0