Prepaid Expenses (Details) - USD ($)	Dec. 31, 2019	Mar. 31, 2019
Prepaid Expenses (Textual)
Prepayments and deferred expenses	$ 46,194	$ 121,257

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