Team Personnel Transactions (Details) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2026	Sep. 30, 2025
Team Personnel Transactions [Abstract]
Team personnel transactions, net provision	$ 3,064	$ 2,382

Provisions (Credit) For Team Personnel Transactions (Net Of Insurance Recoveries where applicable)

No definition available.

Name:	msgk_ProvisionsCreditForTeamPersonnelTransactions
Namespace Prefix:	msgk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration