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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Percentage of change in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

No definition available.

Name:	osis_ContractWithCustomerAssetPercentageOfChange
Namespace Prefix:	osis_
Data Type:	dtr-types:percentItemType
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Period Type:	duration

Amount of transaction price allocated towards customer deposits and prepayments that has not been recognized as revenue.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Percentage of of change in customer deposits and prepayments.

No definition available.

Name:	osis_ContractWithCustomerLiabilityPercentageOfChangeCustomerDepositsAndPrepayments
Namespace Prefix:	osis_
Data Type:	dtr-types:percentItemType
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Percentage of change of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

No definition available.

Name:	osis_ContractWithCustomerLiabilityPercentageOfChangeDeferredRevenueCurrent
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Percentage of change of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.

No definition available.

Name:	osis_ContractWithCustomerLiabilityPercentageOfChangeDeferredRevenueNonCurrent
Namespace Prefix:	osis_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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Amount of increase (decrease) in transaction price allocated towards customer deposits and prepayments that has not been recognized as revenue.

No definition available.

Name:	osis_IncreaseDecreaseContractWithCustomerLiabilityCustomerDepositsAndPrepayments
Namespace Prefix:	osis_
Data Type:	xbrli:monetaryItemType
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Amount of increase (decrease) in current deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

No definition available.

Name:	osis_IncreaseDecreaseInDeferredRevenueCurrent
Namespace Prefix:	osis_
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Amount of increase (decrease) in noncurrent deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

No definition available.

Name:	osis_IncreaseDecreaseInDeferredRevenueNoncurrent
Namespace Prefix:	osis_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the amount of revenue recognized from contract liabilities.

No definition available.

Name:	osis_RevenueRecognizedFromContractLiabilities
Namespace Prefix:	osis_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Percentage of remaining performance obligation expected to be recognized.

No definition available.

Name:	osis_RevenueRemainingPerformanceObligationExpectedTimingPercentage
Namespace Prefix:	osis_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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- References

No definition available.

Name:	us-gaap_ChangeInContractWithCustomerAssetAbstract
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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Publisher FASB
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Balance Type:	debit
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- References

No definition available.

Name:	us-gaap_ContractWithCustomerLiabilityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 45
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-URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130531-203044

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Name:	us-gaap_ContractWithCustomerLiabilityCurrent
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130532-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Name:	us-gaap_ContractWithCustomerLiabilityNoncurrent
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- References

No definition available.

Name:	us-gaap_RevenuePerformanceObligationAbstract
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Indicates (true false) whether practical expedient was elected not to adjust consideration for effect of financing component when transfer and customer payment for product or service occurs within one year or less.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 22
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130569-203045

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Data Type:	xbrli:booleanItemType
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Indicates (true false) whether practical expedient was elected to recognize incremental cost of obtaining contract as expense when incurred if amortization period would have been one year or less.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
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Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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