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Basis of Presentation - Revenue Recognition (Details)	1 Months Ended
	Jan. 31, 2018
SAT
Revenue Recognition
Term of Contract	2 years

X

- Definition

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

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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

X

- Details

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