Accounting Policies Investment in Non Consolidated Entity (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Investment in Non Consolidated entity [Abstract]
Investment in nonconsolidated entity	$ 2,000

Payments to Acquire Investment in non consolidated entities

No definition available.

Name:	msgn_PaymentstoAcquireInvestmentinnonconsolidatedentities
Namespace Prefix:	msgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant