CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES - Financial Covenants (Details) $ in Millions	Mar. 31, 2023 USD ($)
CORPORATE BORROWINGS AND FINANCE LEASE LIABILITIES
Minimum liquidity requirement	$ 100
Amount of minimum liquidity requirements	$ 100

Threshold amount to be maintained by the company to ensure liquidity requirements undrawn under the debt instrument covenant.

No definition available.

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