Segment and Geographic Reporting - Financial Information of Company's Operation by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 5,160,100	$ 3,316,616	$ 3,105,891
Inter-segment revenues	0	0	0
Operating income (loss)	(37,120)	414,294	402,119
Interest expense	(286,872)	(121,254)	(59,899)
Other income, net	(31,566)	(11,233)	10,370
Income taxes	96,100	(47,048)	(55,038)
Net earnings (loss)	(259,458)	234,759	297,552
Depreciation and amortization	681,687	286,779	270,069
Expenditures for property, plant & equipment	436,060	314,332	146,337
Segment assets	13,711,133	7,844,846	6,512,650
Goodwill	4,512,700	1,285,759	1,296,727
Unallocated & Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	0	0	0
Inter-segment revenues	(433,817)	(366,240)	(279,765)
Operating income (loss)	0	(35,870)	(26,772)
Interest expense	0	0	0
Other income, net	0	0	0
Income taxes	0	0	0
Net earnings (loss)	0	0	0
Depreciation and amortization	0	0	0
Expenditures for property, plant & equipment	0	0	0
Segment assets	0	0	0
Goodwill	0	0	0
Networking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Goodwill	1,036,204	1,013,277	1,053,028
Networking | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	2,340,930	2,197,249	2,004,310
Inter-segment revenues	70,120	93,660	76,284
Operating income (loss)	222,365	231,563	201,453
Interest expense	0	0	0
Other income, net	0	0	0
Income taxes	0	0	0
Net earnings (loss)	0	0	0
Depreciation and amortization	172,339	172,092	160,458
Expenditures for property, plant & equipment	98,192	89,616	85,482
Segment assets	3,316,555	4,897,252	4,240,869
Goodwill	1,036,204	1,013,277	1,017,562
Materials
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Goodwill	247,695	272,482	243,699
Materials | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	1,349,758	1,119,367	1,101,581
Inter-segment revenues	362,179	272,580	203,481
Operating income (loss)	159,581	218,601	227,438
Interest expense	0	0	0
Other income, net	0	0	0
Income taxes	0	0	0
Net earnings (loss)	0	0	0
Depreciation and amortization	143,243	114,687	109,611
Expenditures for property, plant & equipment	274,434	224,716	60,855
Segment assets	2,561,156	2,947,594	2,271,781
Goodwill	247,695	272,482	279,165
Lasers
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Goodwill	3,228,801	0	0
Lasers | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	1,469,412	0	0
Inter-segment revenues	1,517	0	0
Operating income (loss)	(419,066)	0	0
Interest expense	0	0	0
Other income, net	0	0	0
Income taxes	0	0	0
Net earnings (loss)	0	0	0
Depreciation and amortization	366,105	0	0
Expenditures for property, plant & equipment	63,434	0	0
Segment assets	7,833,422	0	0
Goodwill	$ 3,228,801	$ 0	$ 0