Intangible Assets and Goodwill - Additional Information (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Aug. 31, 2016 USD ($)	Feb. 28, 2019 USD ($) Multiple	Feb. 28, 2018 USD ($)	Feb. 28, 2017 USD ($)
Intangible Assets And Goodwill [Line Items]
FCC license term		8 years
Indefinite-lived intangible assets		$ 170,547	$ 170,890	$ 197,666
Goodwill Impairment Period of Average Income Used in Test		2 years
Impairment losses on intangible assets		$ 300	265
Amortization of intangible assets		300	300
Goodwill		$ 4,338	$ 4,338
Patents
Intangible Assets And Goodwill [Line Items]
Impairment losses on intangible assets	$ 900
Digonex
Intangible Assets And Goodwill [Line Items]
Impairment losses on intangible assets	$ 2,100
Maximum
Intangible Assets And Goodwill [Line Items]
Amortization of intangible assets				$ 700
Radio | Minimum
Intangible Assets And Goodwill [Line Items]
Goodwill Impairment Market Multiple Used in Test Calculation | Multiple		8.0