Consolidated Statement of Stockholders' Equity (Parenthetical)	12 Months Ended
Oct. 01, 2017 shares
Statement of Stockholders' Equity [Abstract]
Number of share vested	68,000
Number of shares withheld for Income tax requirements	22,201

Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

No definition available.

Name:	opxs_StockVestedDuringPeriodSharesRestrictedStockAward
Namespace Prefix:	opxs_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration