Summary of Significant Accounting Policies - Results of Operations of Disposal Groups (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain on sale of assets, net of disposition costs		$ (235)	$ (31)	$ 31,817
Income before taxes	$ 75,594	5,911	88,080	16,931
Austin Radio Partnership
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net revenues	2,660	7,991	19,539	24,456
Station operating expenses, excluding depreciation and amortization	2,012	5,106	13,428	15,848
Gain on sale of assets, net of disposition costs	37,292		37,292
Depreciation and amortization		115	120	386
Interest expense	32	145	291	423
Income before taxes	37,908	2,625	42,992	7,799
WQHT-FM and WBLS-FM
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Net revenues	9,795	11,535	35,947	35,046
Station operating expenses, excluding depreciation and amortization	7,678	7,809	25,844	24,711
Gain on sale of assets, net of disposition costs	35,616		35,616
Depreciation and amortization		346	417	930
Interest expense	47	94	214	273
Income before taxes	$ 37,686	$ 3,286	$ 45,088	$ 9,132