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Financial Information of Company's Operation by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Jun. 30, 2017
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]          
Revenues $ 294,746 $ 244,987 $ 837,719 $ 698,329  
Operating income 34,738 29,039 97,062 79,866  
Interest expense (5,014) (1,936) (13,303) (4,547)  
Other income (expense), net 1,496 2,164 4,228 9,611  
Income taxes (1,122) (6,837) (27,152) (22,303)  
Net earnings 30,098 22,430 60,835 62,627  
Depreciation and amortization 19,924 14,924 58,149 44,722  
Segment assets 1,737,234   1,737,234   $ 1,477,297
Expenditures for property, plant & equipment 38,614 41,313 115,437 99,135  
Investments 68,222   68,222   $ 11,727
Operating Segments | II-VI Laser Solutions          
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]          
Revenues 109,796 83,648 312,875 244,421  
Inter-segment revenues 8,256 9,661 22,270 24,361  
Operating income 9,932 8,337 22,689 22,628  
Depreciation and amortization 10,306 5,713 27,560 17,025  
Segment assets 769,649   769,649    
Expenditures for property, plant & equipment 16,773 23,299 53,949 59,161  
Operating Segments | II-VI Photonics          
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]          
Revenues 116,778 109,099 337,912 305,824  
Inter-segment revenues (501) 3,450 10,991 10,049  
Operating income 16,637 15,898 53,066 45,689  
Depreciation and amortization 5,651 5,029 18,382 14,853  
Segment assets 586,475   586,475    
Expenditures for property, plant & equipment 15,461 8,727 35,077 21,224  
Operating Segments | II- VI Performance Products          
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]          
Revenues 68,172 52,240 186,932 148,084  
Inter-segment revenues 1,707 2,713 3,691 7,091  
Operating income 8,169 4,804 21,307 11,549  
Depreciation and amortization 3,967 4,182 12,207 12,844  
Segment assets 381,110   381,110    
Expenditures for property, plant & equipment 6,380 9,287 26,411 18,750  
Investments 68,222   68,222    
Eliminations          
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]          
Inter-segment revenues $ (9,462) $ (15,824) $ (36,952) $ (41,501)