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Commitments and Contingencies - Contingent Acquisition Obligations (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2017 USD ($) agreement
Contingent Acquisition Obligations
Maximum amount of future payments under contingent consideration	$ 26,400
Beginning fair value	11,840
Addition of contingent earn-out obligations	3,519
Remeasurement of fair value for contingent earn-out obligations	(975)
Payments on contingent earn-out obligations	(482)
Ending fair value	$ 13,902
Royalty payments
Contingent Acquisition Obligations
Purchase agreements containing royalty payments, number | agreement	1

X

- Definition

Amount of liability recognized arising from addition of contingent earn-out obligations.

+ References

No definition available.

+ Details

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Namespace Prefix:	osis_
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Period Type:	duration

X

- Definition

The cash outflow for contingent consideration in a business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	osis_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The number of purchase agreements which included royalty payment terms.

+ References

No definition available.

+ Details

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Namespace Prefix:	osis_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- References

No definition available.

+ Details

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X

- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

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X

- 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

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X

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ 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)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

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Period Type:	instant

X

- Details

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