Description of Business and Summary of Significant Accounting Policies Goodwill and Intangible Assets Notes (Details) - USD ($)	3 Months Ended		6 Months Ended	12 Months Ended
	Feb. 28, 2019	Feb. 28, 2017	Aug. 31, 2018	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2017	Apr. 18, 2017	Feb. 29, 2016
Goodwill and Intangible Assets [Line Items]
Concentration Risk, Percentage		28.00%		25.00%	26.00%
Finite-Lived Intangible Assets, Remaining Amortization Period				3 years
Finite-Lived Intangible Asset, Weighted Average Period before Next Renewal or Extension				3 years
Goodwill, Impairment Loss		$ 0		$ 0	$ 0
Goodwill	$ 54,785,000	53,905,000		54,785,000	54,785,000	$ 53,905,000	$ 10,000	$ 53,905,000
Finite Lived Intangible Assets, Amortization Expense, Current	6,931,000			6,931,000
Finite Lived Intangible Assets, Amortization Expense, Due in Two Years	6,724,000			6,724,000
Finite Lived Intangible Assets, Amortization Expense, Due in Three Years	6,596,000			6,596,000
Finite Lived Intangible Assets, Amortization Expense, Due in Four Years	5,650,000			5,650,000
Finite Lived Intangible Assets Amortization Expense Next Five Years	$ 5,436,000			5,436,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)		0	$ 9,814,000	25,789,000	0
Impairment of Intangible Assets, Finite-lived				$ 0		0
Indefinite lived tradenames, percentage of total	46.00%			46.00%
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 34,662,000			$ 34,662,000
Amortization of Intangible Assets		6,479,000		6,984,000	6,516,000
Noncash or Part Noncash Acquisition, Intangible Assets Acquired	2,600	0		2,600,000	0
Klipsch [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill	46,533,000			46,533,000
Invision [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill	7,372,000			7,372,000
Rosen [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill	880,000			880,000
Trademarks [Member]
Goodwill and Intangible Assets [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill)	74,955,000			$ 74,955,000	101,391,000
Minimum [Member]
Goodwill and Intangible Assets [Line Items]
Impaired Long-Lived Assets Held and Used, Method for Determining Fair Value				.005
Maximum [Member]
Goodwill and Intangible Assets [Line Items]
Impaired Long-Lived Assets Held and Used, Method for Determining Fair Value				.07
Premium Audio [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill, Impairment Loss		0		$ 0	0
Goodwill	46,533,000	$ 46,533,000		46,533,000	$ 46,533,000	$ 46,533,000		$ 46,533,000
Consumer Accessories [Member]
Goodwill and Intangible Assets [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 15,975,000		$ 9,654,000	$ 25,629,000
Measurement Input, Cap Rate [Member] | Minimum [Member]
Goodwill and Intangible Assets [Line Items]
Impaired Long-Lived Assets Held and Used, Method for Determining Fair Value				0.130
Measurement Input, Cap Rate [Member] | Maximum [Member]
Goodwill and Intangible Assets [Line Items]
Impaired Long-Lived Assets Held and Used, Method for Determining Fair Value				0.131
Measurement Input, Discount Rate [Member] | Minimum [Member]
Goodwill and Intangible Assets [Line Items]
Impaired Long-Lived Assets Held and Used, Method for Determining Fair Value				0.124
Measurement Input, Discount Rate [Member] | Maximum [Member]
Goodwill and Intangible Assets [Line Items]
Impaired Long-Lived Assets Held and Used, Method for Determining Fair Value				0.250
Measurement Input, Long-term Revenue Growth Rate [Member] | Minimum [Member]
Goodwill and Intangible Assets [Line Items]
Impaired Long-Lived Assets Held and Used, Method for Determining Fair Value				0
Measurement Input, Long-term Revenue Growth Rate [Member] | Maximum [Member]
Goodwill and Intangible Assets [Line Items]
Impaired Long-Lived Assets Held and Used, Method for Determining Fair Value			0.03