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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details)	1 Months Ended
	Jan. 31, 2018
SAT
Revenue Recognition
Term of contract	2 years

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- Definition

Period of the contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	osis_TermOfContract
Namespace Prefix:	osis_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_RevenueRecognitionAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_MajorCustomersAxis=osis_ServicioDeAdministracionTributariaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: