Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Dec. 31, 2014
Changes in the carrying amount of goodwill
Balance at the beginning of the period	$ 92,607us-gaap_Goodwill
Goodwill acquired or adjusted during the period	7,516
Foreign currency translation adjustment	(1,713)us-gaap_GoodwillTranslationAdjustments
Balance at the end of the period	98,410us-gaap_Goodwill
Security Division
Changes in the carrying amount of goodwill
Balance at the beginning of the period	29,507
Goodwill acquired or adjusted during the period	957
Foreign currency translation adjustment	(430)
Balance at the end of the period	30,034
Healthcare Division
Changes in the carrying amount of goodwill
Balance at the beginning of the period	37,237
Goodwill acquired or adjusted during the period	6,522
Foreign currency translation adjustment	(656)
Balance at the end of the period	43,103
Optoelectronics and Manufacturing Division
Changes in the carrying amount of goodwill
Balance at the beginning of the period	25,863
Goodwill acquired or adjusted during the period	37
Foreign currency translation adjustment	(627)
Balance at the end of the period	$ 25,273

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

No definition available.

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

- 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

-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

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_GoodwillRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of increase (decrease) from foreign currency translation adjustments 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 (f)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillTranslationAdjustments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=osis_HealthcareDivisionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=osis_OptoelectronicsAndManufacturingDivisionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=osis_SecurityDivisionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: