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Goodwill and Intangible Assets - Goodwill (Details) $ in Thousands	6 Months Ended
	Dec. 31, 2017 USD ($)
Changes in the carrying value of goodwill
Balance at the beginning of the period	$ 242,129
Goodwill acquired or adjusted during the period	42,943
Foreign currency translation adjustment	808
Balance at the end of the period	285,880
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	42,893
Foreign currency translation adjustment	148
Balance at the end of the period	198,124
Healthcare Division
Changes in the carrying value of goodwill
Balance at the beginning of the period	40,129
Foreign currency translation adjustment	107
Balance at the end of the period	40,236
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	50
Foreign currency translation adjustment	553
Balance at the end of the period	$ 47,520

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_
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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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X

- Details

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