Debt Debt (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 11, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Sep. 28, 2015
Line of Credit Facility [Line Items]
Interest Paid, Including Capitalized Interest, Operating and Investing Activities		$ 34,537	$ 43,518	$ 40,106
Debt Instrument, Restrictive Covenants		The Credit Agreement generally requires the Holdings Entities and MSGN L.P. and its restricted subsidiaries on a consolidated basis to comply with a maximum total leverage ratio of 5.50:1.00, subject, at the option of MSGN L.P. to an upward adjustment to 6.00:1.00 during the continuance of certain events. In addition, the Credit Agreement requires a minimum interest coverage ratio of 2.00:1.00 for the Holdings Entities and MSGN L.P. and its restricted subsidiaries on a consolidated basis.
Amortization of Deferred Financing Costs		5 years
Amortization of Debt Issuance Costs		$ 1,994	$ 3,003	$ 3,003
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line Of Credit Facility Maturity Term In Years		5 years
2015 Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 1,550,000
2015 Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					250,000
2019 Term Loan Facility [Member] [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,100,000
2019 Revolving Credit Facility [Member] [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 250,000
Letters of Credit, maximum capacity					$ 35,000
Letters of Credit Outstanding, Amount		$ 0
Line of Credit Facility, Remaining Borrowing Capacity		$ 250
2019 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Additional interest Rate when Default		2.00%
Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Line Of Credit Facility Maturity Term In Years		5 years
Minimum [Member] | 2019 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.225%
Minimum [Member] | Base Rate [Member] | 2019 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.25%
Minimum [Member] | Eurodollar [Member] | 2019 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Maximum [Member] | 2019 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.30%
Maximum [Member] | Base Rate [Member] | 2019 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Maximum [Member] | Eurodollar [Member] | 2019 Credit Agreement [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%