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Commitments and Contingencies (Details) (USD $)	0 Months Ended	9 Months Ended
	Mar. 31, 2015 item	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2014	Jun. 30, 2012
Contingent Acquisition Obligations
Fair value of contingent payment obligations	$ 20,800,000us-gaap_BusinessCombinationContingentConsiderationLiability	$ 20,800,000us-gaap_BusinessCombinationContingentConsiderationLiability		$ 23,200,000us-gaap_BusinessCombinationContingentConsiderationLiability
Environmental Contingencies
Number of investigations discovering soil and groundwater contamination at Hawthorne, CA facility	1osis_NumberOfInvestigationsDiscoveringSoilAndGroundwaterContamination
Changes in provision for warranties
Balance at beginning of period	12,190,000us-gaap_StandardProductWarrantyAccrual	11,923,000us-gaap_StandardProductWarrantyAccrual	12,890,000us-gaap_StandardProductWarrantyAccrual
Additions and adjustments		3,314,000us-gaap_StandardProductWarrantyAccrualWarrantiesIssued	3,306,000us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Reductions for warranty repair costs		(3,047,000)us-gaap_StandardProductWarrantyAccrualPayments	(4,840,000)us-gaap_StandardProductWarrantyAccrualPayments
Balance at end of period	12,190,000us-gaap_StandardProductWarrantyAccrual	12,190,000us-gaap_StandardProductWarrantyAccrual	11,356,000us-gaap_StandardProductWarrantyAccrual
Mexican government
Advances from Customers
Advances from customers	56,300,000us-gaap_CustomerAdvancesAndDeposits / us-gaap_MajorCustomersAxis = osis_MexicanGovernmentMember	56,300,000us-gaap_CustomerAdvancesAndDeposits / us-gaap_MajorCustomersAxis = osis_MexicanGovernmentMember			100,000,000us-gaap_CustomerAdvancesAndDeposits / us-gaap_MajorCustomersAxis = osis_MexicanGovernmentMember
Maximum
Contingent Acquisition Obligations
Maximum amount of future payments under contingent consideration	$ 57,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 57,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_RangeAxis = us-gaap_MaximumMember
Royalty payments
Contingent Acquisition Obligations
Purchase agreements containing royalty payments, number		1osis_NumberOfPurchaseAgreementsIncludingRoyaltyPaymentTerms / us-gaap_ContingentConsiderationByTypeAxis = osis_ContingentConsiderationRoyaltyPaymentsMember

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The number of investigations in which soil and groundwater contamination was discovered.

+ References

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The number of purchase agreements which included royalty payment terms.

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For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Amount of liability recognized arising from contingent consideration in a business combination.

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Refundable consideration, usually cash, held by the entity pending satisfactory completion of the entity's obligations or pending the closing of a contract.

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Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

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Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the standard product warranty. Does not include any Increase or Decrease in the liability for payments related to extended product warranties.

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Represents the aggregate increase in the liability for accruals related to standard product warranties issued during the reporting period. Does not include any increase in the liability for accruals related to extended product warranties.

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