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Stock-based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014 item	Dec. 31, 2013
Stock-based Compensation
Number of share-based employee compensation plans			2osis_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlans
Stock based compensation expense
Stock-based compensation expense before taxes	$ 6,082,000us-gaap_AllocatedShareBasedCompensationExpense	$ 5,083,000us-gaap_AllocatedShareBasedCompensationExpense	$ 12,078,000us-gaap_AllocatedShareBasedCompensationExpense	$ 10,721,000us-gaap_AllocatedShareBasedCompensationExpense
Less: related income tax benefit	(2,354,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	(1,963,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	(4,761,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	(4,138,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Stock-based compensation expense, net of estimated taxes	3,728,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	3,120,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	7,317,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	6,583,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Stock Options
Stock-based compensation, other disclosures
Unrecognized compensation cost	1,200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember		1,200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Weighted-average period	1 year 10 months 24 days
Restricted stock and RSU
Stock-based compensation, other disclosures
Unrecognized compensation cost	24,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = osis_RestrictedStockAndRestrictedStockUnitsMember		24,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = osis_RestrictedStockAndRestrictedStockUnitsMember
Weighted-average period	1 year 9 months 18 days
Cost of good sold
Stock based compensation expense
Stock-based compensation expense before taxes	290,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	255,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	495,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	525,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Selling, general and administrative
Stock based compensation expense
Stock-based compensation expense before taxes	5,724,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember	4,770,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember	11,488,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember	10,072,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember
Research and development
Stock based compensation expense
Stock-based compensation expense before taxes	$ 68,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	$ 58,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	$ 95,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	$ 124,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember

X

- Definition

The number of share-based compensation plans approved by the entity's shareholders.

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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-Name Accounting Standards Codification

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- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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