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Goodwill and Intangible Assets - Goodwill (Details) $ in Thousands	9 Months Ended
	Mar. 31, 2018 USD ($)
Changes in the carrying value of goodwill
Balance at the beginning of the period	$ 242,129
Goodwill acquired or adjusted during the period	57,186
Foreign currency translation adjustment	1,401
Balance at the end of the period	300,716
Security Division
Changes in the carrying value of goodwill
Balance at the beginning of the period	155,083
Goodwill acquired or adjusted during the period	43,106
Foreign currency translation adjustment	259
Balance at the end of the period	198,448
Healthcare Division
Changes in the carrying value of goodwill
Balance at the beginning of the period	40,129
Foreign currency translation adjustment	248
Balance at the end of the period	40,377
Optoelectronics and Manufacturing division
Changes in the carrying value of goodwill
Balance at the beginning of the period	46,917
Goodwill acquired or adjusted during the period	14,080
Foreign currency translation adjustment	894
Balance at the end of the period	$ 61,891

X

- Definition

Represents the amount of goodwill acquired or adjusted in the period and allocated to the reportable segment.

+ References

No definition available.

+ Details

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

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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Balance Type:	credit
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Details

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- Details

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