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Commitments and Contingencies (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 item | Dec. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Jun. 30, 2012
Contingent Acquisition Obligations |  |  |  |  |
Fair value of contingent payment obligations | $ 23,700,000 us-gaap_BusinessCombinationContingentConsiderationLiability | $ 23,700,000 us-gaap_BusinessCombinationContingentConsiderationLiability |  | $ 23,200,000 us-gaap_BusinessCombinationContingentConsiderationLiability |
Environmental Contingencies |  |  |  |  |
Number of investigations discovering soil and groundwater contamination at Hawthorne, CA facility | 1 osis_NumberOfInvestigationsDiscoveringSoilAndGroundwaterContamination |  |  |  |
Changes in provision for warranties |  |  |  |  |
Balance at beginning of period |  | 11,923,000 us-gaap_StandardProductWarrantyAccrual | 12,890,000 us-gaap_StandardProductWarrantyAccrual |  |
Additions and adjustments |  | 2,452,000 us-gaap_StandardProductWarrantyAccrualWarrantiesIssued | 2,536,000 us-gaap_StandardProductWarrantyAccrualWarrantiesIssued |  |
Reductions for warranty repair costs |  | (1,704,000)us-gaap_StandardProductWarrantyAccrualPayments | (2,157,000)us-gaap_StandardProductWarrantyAccrualPayments |  |
Balance at end of period | 12,671,000 us-gaap_StandardProductWarrantyAccrual | 12,671,000 us-gaap_StandardProductWarrantyAccrual | 13,269,000 us-gaap_StandardProductWarrantyAccrual |  |
Other Matters |  |  |  |  |
Period for which Company's Security division has agreed to extend the term of the Administrative Agreement |  | 24 months |  |  |
Mexican government |  |  |  |  |
Advances from Customers |  |  |  |  |
Advances from customers | 62,500,000 us-gaap_CustomerAdvancesAndDeposits / us-gaap_MajorCustomersAxis = osis_MexicanGovernmentMember | 62,500,000 us-gaap_CustomerAdvancesAndDeposits / us-gaap_MajorCustomersAxis = osis_MexicanGovernmentMember |  |  | 100,000,000 us-gaap_CustomerAdvancesAndDeposits / us-gaap_MajorCustomersAxis = osis_MexicanGovernmentMember
Maximum |  |  |  |  |
Contingent Acquisition Obligations |  |  |  |  |
Maximum amount of future payments under contingent consideration | $ 57,000,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 57,000,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Royalty payments |  |  |  |  |
Contingent Acquisition Obligations |  |  |  |  |
Purchase agreements containing royalty payments, number | 1 osis_NumberOfPurchaseAgreementsIncludingRoyaltyPaymentTerms / us-gaap_ContingentConsiderationByTypeAxis = osis_ContingentConsiderationRoyaltyPaymentsMember |  |  |  |

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- Definition 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 -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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