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Balance Sheet Details (Details) (USD $)	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2014
Accounts receivable
Billed receivables	$ 188,351,000us-gaap_BilledContractReceivables		$ 188,351,000us-gaap_BilledContractReceivables		$ 189,489,000us-gaap_BilledContractReceivables
Unbilled receivables	2,727,000us-gaap_UnbilledContractsReceivable		2,727,000us-gaap_UnbilledContractsReceivable		1,975,000us-gaap_UnbilledContractsReceivable
Less allowance for doubtful accounts	(6,850,000)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent		(6,850,000)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent		(5,691,000)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Total	184,228,000us-gaap_AccountsReceivableNetCurrent		184,228,000us-gaap_AccountsReceivableNetCurrent		185,773,000us-gaap_AccountsReceivableNetCurrent
Inventories
Raw materials	154,948,000us-gaap_InventoryRawMaterialsNetOfReserves		154,948,000us-gaap_InventoryRawMaterialsNetOfReserves		117,945,000us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process	52,909,000us-gaap_InventoryWorkInProcessNetOfReserves		52,909,000us-gaap_InventoryWorkInProcessNetOfReserves		33,394,000us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods	56,044,000us-gaap_InventoryFinishedGoodsNetOfReserves		56,044,000us-gaap_InventoryFinishedGoodsNetOfReserves		82,799,000us-gaap_InventoryFinishedGoodsNetOfReserves
Total	263,901,000us-gaap_InventoryNet		263,901,000us-gaap_InventoryNet		234,138,000us-gaap_InventoryNet
Property and equipment
Property and equipment, gross	370,967,000us-gaap_PropertyPlantAndEquipmentGross		370,967,000us-gaap_PropertyPlantAndEquipmentGross		365,216,000us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation and amortization	(155,344,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment		(155,344,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment		(131,038,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment after accumulated depreciation	215,623,000osis_PropertyAndEquipmentNetExcludingLandAndConstructionInProcess		215,623,000osis_PropertyAndEquipmentNetExcludingLandAndConstructionInProcess		234,178,000osis_PropertyAndEquipmentNetExcludingLandAndConstructionInProcess
Land	13,651,000us-gaap_Land		13,651,000us-gaap_Land		13,651,000us-gaap_Land
Construction in process	11,095,000us-gaap_ConstructionInProgressGross		11,095,000us-gaap_ConstructionInProgressGross		12,650,000us-gaap_ConstructionInProgressGross
Property and equipment, net	240,369,000us-gaap_PropertyPlantAndEquipmentNet		240,369,000us-gaap_PropertyPlantAndEquipmentNet		260,479,000us-gaap_PropertyPlantAndEquipmentNet
Depreciation expense	13,300,000us-gaap_Depreciation	12,300,000us-gaap_Depreciation	30,200,000us-gaap_Depreciation	23,800,000us-gaap_Depreciation
Buildings and improvements
Property and equipment
Property and equipment, gross	166,453,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember		166,453,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember		163,952,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember
Leasehold improvements
Property and equipment
Property and equipment, gross	10,318,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember		10,318,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember		9,744,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember
Equipment and tooling
Property and equipment
Property and equipment, gross	155,642,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = osis_EquipmentAndToolingMember		155,642,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = osis_EquipmentAndToolingMember		154,367,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = osis_EquipmentAndToolingMember
Furniture and fixtures
Property and equipment
Property and equipment, gross	4,093,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember		4,093,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember		4,017,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember
Computer equipment
Property and equipment
Property and equipment, gross	18,276,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember		18,276,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember		17,466,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember
Software development costs
Property and equipment
Property and equipment, gross	$ 16,185,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember		$ 16,185,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember		$ 15,670,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember

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