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Stockholders' Equity - Share Repurchase Program (Details) - shares | Sep. 30, 2016 | Apr. 30, 2016 | Oct. 31, 2015 | Apr. 30, 2013 | Sep. 30, 2004 | Mar. 31, 1999
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Share Repurchase Program |  |  |  |  |  |
Number of repurchased shares authorized |  | 1,000,000 | 500,000 | 1,000,000 | 1,000,000 | 2,000,000
Number of available shares may be repurchased | 1,020,763 |  |  |  |  |

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- References No definition available. + Details
Name: | osis_ShareRepurchaseProgramAbstract
Namespace Prefix: | osis_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant