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Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	6 Months Ended
	Dec. 31, 2018 USD ($)
Goodwill [Line Items]
Balance-beginning of period	$ 270,678
Goodwill acquired	30,016
Foreign currency translation	(2,444)
Balance-end of period	298,250
II-VI Laser Solutions
Goodwill [Line Items]
Balance-beginning of period	98,737
Foreign currency translation	(831)
Balance-end of period	97,906
II-VI Photonics
Goodwill [Line Items]
Balance-beginning of period	109,670
Goodwill acquired	26,015
Foreign currency translation	(1,613)
Balance-end of period	134,072
II-VI Performance Products
Goodwill [Line Items]
Balance-beginning of period	62,271
Goodwill acquired	4,001
Balance-end of period	$ 66,272

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

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-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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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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-SubTopic 20
-Section 50
-Paragraph 1
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- 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

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-Topic 350
-SubTopic 20
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