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Segment Reporting - Financial Information of Company's Operations by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenues $ 1,053,083 $ 1,344,570  
Inter-segment revenues 0 0  
Operating income (loss) (21,308) 42,476  
Interest expense (73,258) (61,889)  
Other income (expense), net 6,269 (31,605)  
Income tax benefit 20,763 12,320  
Net loss (67,534) (38,698)  
Depreciation and amortization 138,359 147,286  
Expenditures for property, plant & equipment 62,197 138,990  
Segment assets 13,521,298   $ 13,711,133
Goodwill 4,460,144   4,512,700
Networking      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Goodwill 1,035,651   1,036,204
Materials      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Goodwill 247,049   247,695
Lasers      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Goodwill 3,177,444   $ 3,228,801
Operating Segments | Networking      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenues 472,849 596,548  
Inter-segment revenues 12,887 18,740  
Operating income (loss) 16,317 90,982  
Interest expense 0 0  
Other income (expense), net 0 0  
Income tax benefit 0 0  
Net loss 0 0  
Depreciation and amortization 40,436 42,774  
Expenditures for property, plant & equipment 17,493 43,830  
Segment assets 3,329,101    
Goodwill 1,035,651    
Operating Segments | Materials      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenues 244,640 355,644  
Inter-segment revenues 87,742 95,054  
Operating income (loss) 7,182 75,335  
Interest expense 0 0  
Other income (expense), net 0 0  
Income tax benefit 0 0  
Net loss 0 0  
Depreciation and amortization 25,287 26,527  
Expenditures for property, plant & equipment 40,512 74,898  
Segment assets 2,100,915    
Goodwill 247,049    
Operating Segments | Lasers      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenues 335,594 392,378  
Inter-segment revenues 639 166  
Operating income (loss) (44,807) (123,841)  
Interest expense 0 0  
Other income (expense), net 0 0  
Income tax benefit 0 0  
Net loss 0 0  
Depreciation and amortization 72,636 77,985  
Expenditures for property, plant & equipment 4,192 20,262  
Segment assets 8,091,282    
Goodwill 3,177,444    
Unallocated & Other      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Revenues 0 0  
Inter-segment revenues (101,268) (113,960)  
Operating income (loss) 0 0  
Interest expense 0 0  
Other income (expense), net 0 0  
Income tax benefit 0 0  
Net loss 0 0  
Depreciation and amortization 0 0  
Expenditures for property, plant & equipment 0 $ 0  
Segment assets 0    
Goodwill $ 0