CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES - Financial Covenants (Details) $ in Millions	Sep. 30, 2023 USD ($)
CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES
Minimum liquidity requirement	$ 100

The amount of minimum liquidity requirement to be maintained by the company.

No definition available.

Name:	amch_MinimumLiquidityRequirement
Namespace Prefix:	amch_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant