Description of Business and Summary of Significant Accounting Policies Goodwill Table (Details) - USD ($)	6 Months Ended	12 Months Ended
	Aug. 31, 2015	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015	Feb. 28, 2014
Goodwill [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)				$ 0
Goodwill		$ 103,212,000	$ 104,349,000	105,874,000	$ 117,938,000
Goodwill, Impairment Loss		0	0	0
Goodwill, Translation Adjustments		(1,137,000)	(1,525,000)	(12,064,000)
Goodwill, Gross		135,375,000	136,512,000	138,037,000
Goodwill, Impaired, Accumulated Impairment Loss		(32,163,000)	(32,163,000)	(32,163,000)
Automotive [Member]
Goodwill [Line Items]
Goodwill		56,679,000	57,816,000	59,341,000	71,405,000
Goodwill, Translation Adjustments		(1,137,000)	(1,525,000)	(12,064,000)
Goodwill, Gross		56,679,000	57,816,000	59,341,000
Goodwill, Impaired, Accumulated Impairment Loss		0	0	0
Premium Audio [Member]
Goodwill [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)			6,210,000
Goodwill		46,533,000	46,533,000	46,533,000	$ 46,533,000
Goodwill, Impairment Loss		0	0	0
Goodwill, Gross		78,696,000	78,696,000	78,696,000
Goodwill, Impaired, Accumulated Impairment Loss		$ 32,163,000	$ 32,163,000	$ 32,163,000
Minimum [Member]
Goodwill [Line Items]
Fair Value Inputs, Discount Rate		0.00%
Maximum [Member]
Goodwill [Line Items]
Fair Value Inputs, Discount Rate		35.00%
Goodwill [Member] | Minimum [Member]
Goodwill [Line Items]
Fair Value Inputs, Discount Rate	13.10%	12.40%
Goodwill [Member] | Maximum [Member]
Goodwill [Line Items]
Fair Value Inputs, Discount Rate	13.80%	13.00%