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Revenue from Contracts with Customers - Summary of Disaggregated Revenue by Revenue Market and Product (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Revenue	$ 342,839	$ 281,470	$ 657,272	$ 542,973
II-VI Laser Solutions
Disaggregation Of Revenue [Line Items]
Revenue	105,577		211,752
II-VI Performance Products
Disaggregation Of Revenue [Line Items]
Revenue	77,568		150,670
II-VI Photonics
Disaggregation Of Revenue [Line Items]
Revenue	159,694		294,850
Commercial | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue	298,663		576,895
Commercial | Services
Disaggregation Of Revenue [Line Items]
Revenue	4,618		10,404
Commercial | II-VI Laser Solutions | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue	100,894		203,764
Commercial | II-VI Laser Solutions | Services
Disaggregation Of Revenue [Line Items]
Revenue	1,363		2,253
Commercial | II-VI Performance Products | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue	39,804		81,801
Commercial | II-VI Performance Products | Services
Disaggregation Of Revenue [Line Items]
Revenue	1,526		4,631
Commercial | II-VI Photonics | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue	157,965		291,330
Commercial | II-VI Photonics | Services
Disaggregation Of Revenue [Line Items]
Revenue	1,729		3,520
U.S. Government | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue	33,507		60,687
U.S. Government | Services
Disaggregation Of Revenue [Line Items]
Revenue	6,051		9,286
U.S. Government | II-VI Laser Solutions | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue	3,320		5,735
U.S. Government | II-VI Performance Products | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue	30,187		54,952
U.S. Government | II-VI Performance Products | Services
Disaggregation Of Revenue [Line Items]
Revenue	$ 6,051		$ 9,286

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+ References

No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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