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Financial Information of Company's Operation by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                      
Revenues $ 321,075 $ 294,746 $ 281,470 $ 261,503 $ 273,717 $ 244,987 $ 231,822 $ 221,520 $ 1,158,794 $ 972,046 $ 827,216
Operating income                 135,287 115,540 91,813
Interest expense (5,049) (5,014) (4,644) (3,645) (2,262) (1,936) (1,365) (1,246) (18,352) (6,809) (3,081)
Other income, net 1,031 1,496 1,965 767 445 2,164 6,045 1,402 5,259 10,056 1,223
Income taxes (7,040) (1,122) (20,272) (5,758) (1,211) (6,837) (7,913) (7,553) (34,192) (23,514) (24,469)
Net earnings 27,167 $ 30,098 $ 9,596 $ 21,141 32,647 $ 22,430 $ 23,903 $ 16,294 88,002 95,274 65,486
Depreciation and amortization                 80,770 63,637 56,663
Expenditures for property, plant & equipment                 161,323 142,945 58,170
Segment assets 1,761,661       1,477,297       1,761,661 1,477,297  
Equity Investment 69,215       11,727       69,215 11,727  
Goodwill 270,678       250,342       270,678 250,342 233,755
II-VI Laser Solutions                      
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                      
Goodwill 103,390       84,180       103,390 84,180 84,105
II-VI Photonics                      
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                      
Goodwill 114,398       113,272       114,398 113,272 96,760
II- VI Performance Products                      
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                      
Goodwill 52,890       52,890       52,890 52,890 52,890
Operating Segments | II-VI Laser Solutions                      
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                      
Revenues                 427,968 339,341 303,002
Inter-segment revenues                 34,661 33,792 24,290
Operating income                 36,797 30,931 36,184
Depreciation and amortization                 38,552 24,958 17,222
Expenditures for property, plant & equipment                 82,478 82,760 25,620
Segment assets 760,988       589,239       760,988 589,239  
Goodwill 103,390       84,180       103,390 84,180  
Operating Segments | II-VI Photonics                      
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                      
Revenues                 464,457 418,515 325,879
Inter-segment revenues                 14,542 14,236 12,081
Operating income                 67,732 62,975 37,849
Depreciation and amortization                 24,984 21,442 19,855
Expenditures for property, plant & equipment                 39,162 27,397 21,096
Segment assets 595,909       578,315       595,909 578,315  
Goodwill 114,398       113,272       114,398 113,272  
Operating Segments | II- VI Performance Products                      
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                      
Revenues                 266,369 214,190 198,335
Inter-segment revenues                 5,609 10,189 7,274
Operating income                 30,758 21,635 17,780
Depreciation and amortization                 17,234 17,237 19,586
Expenditures for property, plant & equipment                 39,683 32,788 11,454
Segment assets 404,764       309,743       404,764 309,743  
Equity Investment 69,215       11,727       69,215 11,727  
Goodwill $ 52,890       $ 52,890       52,890 52,890  
Eliminations                      
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                      
Inter-segment revenues                 $ (54,812) $ (58,217) $ (43,645)