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Financial Information of Company's Operation by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]          
Revenues $ 342,839 $ 281,470 $ 657,272 $ 542,973  
Operating income (expense) 39,606 32,486 76,819 62,261  
Interest expense (5,580) (4,644) (11,164) (8,289)  
Other income (expense), net 701 2,026 1,414 2,796  
Income taxes (6,025) (20,272) (12,218) (26,030)  
Net earnings 28,702 9,596 54,851 30,737  
Depreciation and amortization 22,329 19,409 44,499 38,225  
Segment assets 1,877,134   1,877,134   $ 1,761,661
Expenditures for property, plant & equipment 38,468 39,397 73,386 76,823  
Investments 76,441   76,441   $ 69,215
II-VI Laser Solutions          
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]          
Revenues 105,577   211,752    
II-VI Photonics          
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]          
Revenues 159,694   294,850    
II-VI Performance Products          
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]          
Revenues 77,568   150,670    
Operating Segments | II-VI Laser Solutions          
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]          
Revenues 105,577 105,033 211,752 192,969  
Inter-segment revenues 13,632 6,887 27,185 14,067  
Operating income (expense) 12,222 9,442 24,532 12,094  
Depreciation and amortization 10,626 8,829 21,473 17,053  
Segment assets 697,948   697,948    
Expenditures for property, plant & equipment 15,301 23,422 26,894 36,183  
Operating Segments | II-VI Photonics          
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]          
Revenues 159,694 115,304 294,850 231,244  
Inter-segment revenues 2,440 5,497 5,336 8,360  
Operating income (expense) 23,087 16,237 38,999 35,663  
Depreciation and amortization 6,462 5,669 12,661 11,176  
Segment assets 697,856   697,856    
Expenditures for property, plant & equipment 11,223 7,893 23,274 17,676  
Operating Segments | II-VI Performance Products          
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]          
Revenues 77,568 61,133 150,670 118,760  
Inter-segment revenues 6,059 6,320 11,721 12,310  
Operating income (expense) 11,400 6,807 20,391 14,504  
Depreciation and amortization 5,241 4,911 10,365 9,996  
Segment assets 481,331   481,331    
Expenditures for property, plant & equipment 11,945 8,082 23,219 22,965  
Investments 76,441   76,441    
Eliminations & Other          
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]          
Inter-segment revenues (22,131) $ (18,704) (44,242) $ (34,737)  
Operating income (expense) $ (7,103)   $ (7,103)