Long-term Debt - Additional Information (Detail)			9 Months Ended
	Apr. 30, 2015 USD ($)	Jun. 10, 2014 USD ($)	Nov. 30, 2015 USD ($)	Feb. 28, 2015 USD ($)	Jun. 16, 2014 USD ($)	May. 30, 2012 USD ($)
Debt Instrument
Unamortized discount on issuance of debt			$ 6,592,000	$ 6,382,000
98.7FM Non-recourse debt
Debt Instrument
Face amount of debt						$ 82,200,000
Interest rate during period						4.10%
Non-recourse debt			66,692,000	70,401,000
Digonex Non-recourse debt
Debt Instrument
Face amount of debt					$ 6,200,000
Interest rate during period					5.00%
Non-recourse debt			4,528,000	3,971,000	$ 3,600,000
Digonex Non-recourse debt | Non-recourse debt
Debt Instrument
Face amount of debt			6,200,000.0
Two Thousand Fourteen Credit Agreement
Debt Instrument
Total Credit Agreement debt			$ 188,687,000	193,000,000
Provision for credit facility increase		$ 20,000,000
Borrowings on revolving credit facility		13,000,000
Percentage of principal due in quarterly installments			1.00%
Commitment fee			5000.00%
Amortization of financing costs			$ 1,000,000
Unamortized discount on issuance of debt		6,100,000	6,600,000
Two Thousand Fourteen Credit Agreement | Term Loan
Debt Instrument
Total Credit Agreement debt			182,687,000	185,000,000
Maximum borrowing capacity		185,000,000.0
Face amount of debt		185,000,000
Proceeds from issuance of debt		109,000,000
Long-term debt held in escrow		76,000,000
Two Thousand Fourteen Credit Agreement | Revolver
Debt Instrument
Total Credit Agreement debt			6,000,000	$ 8,000,000
Maximum borrowing capacity		20,000,000.0
Two Thousand Fourteen Credit Agreement | Letter of Credit
Debt Instrument
Maximum borrowing capacity		5,000,000.0
First Amendment to Two Thousand Twelve Credit Agreement [Member]
Debt Instrument
Amortization of financing costs			0
First Amendment to Two Thousand Fourteen Credit Agreement
Debt Instrument
Amortization of financing costs			$ 1,000,000
Debt covenant increased leverage ratio amount			6.00
Debt covenant maximum severance expense excluded from consolidated EBITDA			$ 5,000,000
Debt covenant, maximum losses attributable to reformatting of radio stations included in consolidated EBITDA			$ 2,500,000.0
Prepayment fee, percentage			1.00%
Increase in basis spread on variable rate			0.25%
Debt covenant, leverage ratio threshold for applicable margin			5.00
Second Amendment to Two Thousand Fourteen Credit Agreement [Member]
Debt Instrument
Debt Instrument, Periodic Payment, Percentage of Principal Due in Quarterly Installments, Period One	0.50%
Debt Instrument, Periodic Payment, Percentage of Principal Due in Quarterly Installments, Period Two	1.25%
Amortization of financing costs	$ 1,100,000
Debt Instrument, Debt Covenant, Leverage Ratio, Period One, Maximum	6.75
Debt Instrument, Debt Covenant, Leverage Ratio, Period Two, Maximum	6.50
Debt Instrument, Debt Covenant, Leverage Ratio, Period Three, Maximum	6.25
Debt Instrument, Debt Covenant, Leverage Ratio, Period Four, Maximum	6.00
Debt Instrument, Debt Covenant, Leverage Ratio, Period Five, Maximum	5.75
Debt Instrument, Debt Covenant, Leverage Ratio, Period Six, Maximum	4.00
Debt Instrument, Prepayment Fee, Period One, Percentage	2.00%
Debt Instrument, Prepayment Fee, Period Two, Percentage	1.00%
Base Rate | Two Thousand Fourteen Credit Agreement
Debt Instrument
Minimum interest rate as a percentage			2.00%
Basis spread on interest rate			3.75%
Base Rate | Second Amendment to Two Thousand Fourteen Credit Agreement [Member]
Debt Instrument
Basis spread on interest rate	5.00%
London Interbank Offered Rate (LIBOR) | Two Thousand Fourteen Credit Agreement
Debt Instrument
Minimum interest rate as a percentage			1.00%
Basis spread on interest rate			4.75%
London Interbank Offered Rate (LIBOR) | Second Amendment to Two Thousand Fourteen Credit Agreement [Member]
Debt Instrument
Basis spread on interest rate	6.00%
WBLS-FM and WLIB-AM
Debt Instrument
Cash paid at first closing		55,000,000
Cash payable at second closing		$ 76,000,000