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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		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Revenue	$ 342,496	$ 294,746	$ 999,768	$ 837,719
II-VI Laser Solutions
Disaggregation Of Revenue [Line Items]
Revenue	97,474		309,226
II-VI Photonics
Disaggregation Of Revenue [Line Items]
Revenue	166,473		461,323
II-VI Performance Products
Disaggregation Of Revenue [Line Items]
Revenue	78,549		229,219
Commercial | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue	308,075		884,970
Commercial | Services
Disaggregation Of Revenue [Line Items]
Revenue	5,014		15,418
Commercial | II-VI Laser Solutions | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue	94,907		298,671
Commercial | II-VI Laser Solutions | Services
Disaggregation Of Revenue [Line Items]
Revenue	267		2,520
Commercial | II-VI Photonics | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue	164,074		455,404
Commercial | II-VI Photonics | Services
Disaggregation Of Revenue [Line Items]
Revenue	2,399		5,919
Commercial | II-VI Performance Products | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue	49,094		130,895
Commercial | II-VI Performance Products | Services
Disaggregation Of Revenue [Line Items]
Revenue	2,348		6,979
U.S. Government | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue	27,144		87,831
U.S. Government | Services
Disaggregation Of Revenue [Line Items]
Revenue	2,263		11,549
U.S. Government | II-VI Laser Solutions | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue	2,286		8,021
U.S. Government | II-VI Laser Solutions | Services
Disaggregation Of Revenue [Line Items]
Revenue	14		14
U.S. Government | II-VI Performance Products | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Revenue	24,858		79,810
U.S. Government | II-VI Performance Products | Services
Disaggregation Of Revenue [Line Items]
Revenue	$ 2,249		$ 11,535

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ 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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