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Basis of Presentation - Description of Business (Details) | 3 Months Ended
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Sep. 30, 2019 segment
Description of Business |
Number of reporting segments | 3

X
- References No definition available. + Details
Name: | osis_BusinessDescriptionAbstract
Namespace Prefix: | osis_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration