Intangible Assets and Goodwill - Additional Interim Impairment Assessments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment losses on intangible assets	$ 265	$ 9,843	$ 9,499
Scenario Four [Member] | Fcc Licenses
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment losses on intangible assets		6,855	5,440
Scenario Four [Member] | Goodwill
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment losses on intangible assets	$ 265		695
Scenario Four [Member] | Finite-Lived Intangible Assets [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment losses on intangible assets			$ 3,364
Scenario Three [Member] | Goodwill
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment losses on intangible assets		2,058
Scenario Three [Member] | Finite-Lived Intangible Assets [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment losses on intangible assets		$ 930