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Goodwill and Intangible Assets - Goodwill (Details) $ in Thousands	6 Months Ended
	Dec. 31, 2018 USD ($)
Changes in the carrying value of goodwill
Balance at the beginning of the period	$ 292,213
Goodwill acquired or adjusted during the period	13,956
Foreign currency translation adjustment	(1,005)
Balance at the end of the period	305,164
Security Division
Changes in the carrying value of goodwill
Balance at the beginning of the period	191,810
Goodwill acquired or adjusted during the period	6,541
Foreign currency translation adjustment	(65)
Balance at the end of the period	198,286
Healthcare Division
Changes in the carrying value of goodwill
Balance at the beginning of the period	40,157
Foreign currency translation adjustment	(102)
Balance at the end of the period	40,055
Optoelectronics and Manufacturing Division
Changes in the carrying value of goodwill
Balance at the beginning of the period	60,246
Goodwill acquired or adjusted during the period	7,415
Foreign currency translation adjustment	(838)
Balance at the end of the period	$ 66,823

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
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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://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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Period Type:	instant

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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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.

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