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Stock-based Compensation (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Mar. 31, 2014
Stock Options      
Number of Options      
Outstanding at the beginning of the period (in shares) 1,028,505us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1,022,991us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Granted (in shares)   43,616us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Exercised (in shares)   (27,510)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Expired or forfeited (in shares)   (10,592)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Outstanding at the end of the period (in shares) 1,028,505us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1,028,505us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Exercisable at the end of the period (in shares) 938,209us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
938,209us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Weighted-Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 27.52us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 26.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Granted (in dollars per share)   $ 68.08us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Exercised (in dollars per share)   $ 45.13us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Expired or forfeited (in dollars per share)   $ 59.87us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Outstanding at the end of the period (in dollars per share) $ 27.52us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 27.52us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Exercisable at the end of the period (in dollars per share) $ 24.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 24.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Weighted-Average Remaining Contractual Term      
Outstanding at the end of the period 5 years    
Exercisable at the end of the period 4 years 8 months 12 days    
Aggregate Intrinsic Value      
Outstanding at the end of the period $ 48,073us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 48,073us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Exercisable at the end of the period $ 46,939us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 46,939us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Restricted stock and RSU      
Shares      
Nonvested at the beginning of the period (in shares)   661,400us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= osis_RestrictedStockAndRestrictedStockUnitsMember
 
Granted (in shares)   280,047us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= osis_RestrictedStockAndRestrictedStockUnitsMember
 
Vested (in shares)   (257,165)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= osis_RestrictedStockAndRestrictedStockUnitsMember
 
Forfeited (in shares)   (14,884)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= osis_RestrictedStockAndRestrictedStockUnitsMember
 
Nonvested at the end of the period (in shares) 669,398us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= osis_RestrictedStockAndRestrictedStockUnitsMember
669,398us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= osis_RestrictedStockAndRestrictedStockUnitsMember
 
Weighted-Average Fair Value      
Nonvested at the beginning of the period (in dollars per share)   $ 54.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= osis_RestrictedStockAndRestrictedStockUnitsMember
 
Granted (in dollars per share)   $ 64.67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= osis_RestrictedStockAndRestrictedStockUnitsMember
 
Vested (in dollars per share)   $ 42.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= osis_RestrictedStockAndRestrictedStockUnitsMember
 
Forfeited (in dollars per share)   $ 51.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= osis_RestrictedStockAndRestrictedStockUnitsMember
 
Nonvested at the end of the period (in dollars per share) $ 63.68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= osis_RestrictedStockAndRestrictedStockUnitsMember
$ 63.68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= osis_RestrictedStockAndRestrictedStockUnitsMember
 
Performance-based restricted stock units      
Shares      
Granted (in shares)   151,469us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= osis_PerformanceBasedRestrictedStockUnitsMember
160,922us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= osis_PerformanceBasedRestrictedStockUnitsMember
Performance-based restricted stock units | Minimum      
Weighted-Average Fair Value      
Payout as a percentage of the original number of shares awarded or units awarded, which are converted into shares of the Company's common stock   0.00%osis_ShareBasedCompensationByShareBasedPaymentAwardPerformanceBasedAwardsPayoutPercentage
/ us-gaap_AwardTypeAxis
= osis_PerformanceBasedRestrictedStockUnitsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Performance-based restricted stock units | Maximum      
Weighted-Average Fair Value      
Payout as a percentage of the original number of shares awarded or units awarded, which are converted into shares of the Company's common stock   250.00%osis_ShareBasedCompensationByShareBasedPaymentAwardPerformanceBasedAwardsPayoutPercentage
/ us-gaap_AwardTypeAxis
= osis_PerformanceBasedRestrictedStockUnitsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
2012 Plan      
Weighted-Average Fair Value      
Securities available for grant 3,003,782us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= osis_IncentiveAwardPlan2012Member
3,003,782us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= osis_IncentiveAwardPlan2012Member
 
2012 Plan | Restricted stock and RSU      
Weighted-Average Fair Value      
Number of shares available for grant reduced for each award granted   1.87osis_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantReducedForEachAwardGranted
/ us-gaap_AwardTypeAxis
= osis_RestrictedStockAndRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= osis_IncentiveAwardPlan2012Member
 
Number of shares available for grant increased for each award forfeited and returned   1.87osis_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrantIncreasedForEachAwardForfeitedAndReturned
/ us-gaap_AwardTypeAxis
= osis_RestrictedStockAndRestrictedStockUnitsMember
/ us-gaap_PlanNameAxis
= osis_IncentiveAwardPlan2012Member