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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
Inter-segment revenues                 0 0 0
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
I I V I Compound Semiconductors                      
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                      
Revenues                 723,607 672,309 531,685
Inter-segment revenues                 94,405 37,723 34,740
Operating income                 82,414 73,611 49,094
Interest expense                 0 0 0
Other income, net                 0 0 0
Income taxes                 0 0 0
Net earnings                 0 0 0
Depreciation and amortization                 66,092 57,528 42,025
Expenditures for property, plant & equipment                 83,899 125,201 114,134
Segment assets 1,272,163       1,207,087       1,272,163 1,207,087  
Goodwill 185,721       161,008       185,721 161,008 141,798
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                 12,568 24,867 18,223
Operating income                 81,898 63,152 66,462
Interest expense                 0 0 0
Other income, net                 0 0 0
Income taxes                 0 0 0
Net earnings                 0 0 0
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       134,057 109,670 108,544
Unallocated and Other                      
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]                      
Revenues                 0 0 0
Inter-segment revenues                 (106,973) (62,591) (52,963)
Operating income                 (15,643) 0 0
Interest expense                 0 0 0
Other income, net                 0 0 0
Income taxes                 0 0 0
Net earnings                 0 0 0
Depreciation and amortization                 0 0 0
Expenditures for property, plant & equipment                 0 0 $ 0
Segment assets 0       0       0 0  
Goodwill $ 0       $ 0       $ 0 $ 0