Prepaid Expenses (Details) - USD ($)	Jun. 30, 2020	Mar. 31, 2020
Prepaid Expenses (Textual)
Prepayments and deferred expenses	$ 63,124	$ 48,789

Amount represent the prepayments and deferred expenses.

No definition available.

Name:	oacl_PrepaymentsAndDeferredExpenses
Namespace Prefix:	oacl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant