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STOCKHOLDERS' EQUITY - Share Repurchase Program (Details) - shares	Jun. 30, 2021	Aug. 31, 2020	Jun. 30, 2020	Apr. 30, 2020	Jun. 30, 2019
Share Repurchase Program
Number of repurchased shares authorized	452,005	3,000,000	562,707	1,000,000	288,316
Number of shares available for repurchase	2,547,995

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- References

No definition available.

+ Details

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

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant