PREPAYMENTS AND DEFERRED EXPENSES (Details Narrative) - USD ($)	Sep. 30, 2018	Mar. 31, 2018
Prepayments And Deferred Expenses
Prepayments and deferred expenses	$ 373,937	$ 526,100

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