CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)	6 Months Ended
Sep. 30, 2018
Statement of Cash Flows [Abstract]
Payment to Lvxin original shareholders for transfer of 51% interest	0.51

Represents information related to payment to lvxin original shareholders for transfer of fifty one percentage of interest.

No definition available.

Name:	oacl_PaymentToLvxinOriginalShareholdersForTransferOfFiftyOnePercentageOfInterest
Namespace Prefix:	oacl_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration