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Financial Information of Company's Operation by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenues	$ 362,728	$ 342,496	$ 342,839	$ 314,433	$ 321,075	$ 294,746	$ 281,470	$ 261,503	$ 1,362,496	$ 1,158,794	$ 972,046
Operating income									148,668	136,763	115,556
Interest expense	(5,606)	(5,647)	(5,580)	(5,584)	(5,049)	(5,014)	(4,644)	(3,645)	(22,417)	(18,352)	(6,809)
Other income, net	(384)	1,532	701	713	(768)	1,755	2,026	770	2,562	3,783	10,041
Income taxes	(6,701)	(2,377)	(6,025)	(6,193)	(7,040)	(1,122)	(20,272)	(5,758)	(21,296)	(34,192)	(23,514)
Net earnings	28,028	$ 24,638	$ 28,702	$ 26,149	27,167	$ 30,098	$ 9,596	$ 21,141	107,517	88,002	95,274
Depreciation and amortization									92,365	80,770	63,637
Expenditures for property, plant & equipment									128,750	161,323	142,945
Segment assets	1,953,773				1,761,661				1,953,773	1,761,661
Goodwill	319,778				270,678				319,778	270,678	250,342
II-VI Laser Solutions
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenues									396,573
Goodwill	97,881				98,737				97,881	98,737	79,527
II-VI Photonics
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenues									638,889
Goodwill	134,057				109,670				134,057	109,670	108,544
II-VI Performance Products
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenues									327,034
Goodwill	87,840				62,271				87,840	62,271	62,271
Operating Segments | II-VI Laser Solutions
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenues									396,573	405,940	317,495
Inter-segment revenues									91,507	34,590	33,669
Operating income									40,261	40,119	27,459
Depreciation and amortization									44,529	38,004	24,684
Expenditures for property, plant & equipment									43,936	80,776	81,346
Segment assets	716,788				740,020				716,788	740,020
Goodwill	97,881				98,737				97,881	98,737
Operating Segments | II-VI Photonics
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenues									638,889	486,485	440,361
Inter-segment revenues									10,745	11,180	8,003
Operating income									81,898	63,152	66,462
Depreciation and amortization									26,273	23,242	21,612
Expenditures for property, plant & equipment									44,851	36,122	28,811
Segment assets	681,610				554,574				681,610	554,574
Goodwill	134,057				109,670				134,057	109,670
Operating Segments | II-VI Performance Products
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenues									327,034	266,369	214,190
Inter-segment revenues									20,928	26,262	10,189
Operating income									42,153	33,492	21,635
Depreciation and amortization									21,563	19,524	17,341
Expenditures for property, plant & equipment									39,963	44,425	32,788
Segment assets	555,375				467,067				555,375	467,067
Goodwill	$ 87,840				$ 62,271				87,840	62,271
Eliminations & Other
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Inter-segment revenues									(123,180)	$ (72,032)	$ (51,861)
Operating income									$ (15,643)

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