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Data Type:	xbrli:monetaryItemType
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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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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
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Percentage of of change in customer deposits and prepayments.

No definition available.

Name:	osis_ContractWithCustomerLiabilityPercentageOfChangeCustomerDepositsAndPrepayments
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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.

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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
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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.

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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.

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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
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Represents the amount of revenue recognized from contract liabilities.

No definition available.

Name:	osis_RevenueRecognizedFromContractLiabilities
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Percentage of remaining performance obligation expected to be recognized.

No definition available.

Name:	osis_RevenueRemainingPerformanceObligationExpectedTimingPercentage
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Data Type:	dtr-types:percentItemType
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- References

No definition available.

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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
-Topic 606
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- References

No definition available.

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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.

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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.

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- References

No definition available.

Name:	us-gaap_RevenuePerformanceObligationAbstract
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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.

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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
-Topic 606
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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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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.

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