Segment Reporting - Schedule of Financial Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Mar. 31, 2026	Jun. 30, 2025	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 1,805,641		$ 1,497,879	$ 5,072,648	$ 4,280,679
Segment cost of goods sold and operating expenses	1,621,294		1,487,989	4,503,427	4,123,082
Segment profit	448,252		347,730	1,252,309	964,835
Corporate and centralized function costs	(82,147)		(68,477)	(242,380)	(202,986)
Share-based compensation	(50,572)		(40,166)	(139,901)	(116,656)
Restructuring costs	(34,406)		(73,769)	(57,291)	(106,154)
Impairment of assets held-for-sale	0		0	(20,112)	0
Integration, site consolidation and other costs	(18,743)		(6,404)	(62,421)	(24,483)
Amortization of intangibles	(70,469)		(87,163)	(210,423)	(230,741)
Interest expense	(44,558)		(57,284)	(149,216)	(188,206)
Gain on sale of business	8,922		0	124,133	0
Other income (expense), net	28,068		(4,577)	74,523	61,988
Earnings Before Income Taxes	184,347		9,890	569,221	157,597
Consulting and legal costs related to projects to integrate recent acquisitions	19,000		5,000	62,000	21,000
Employee severance and retention costs			1,000		3,000
Datacenter & Communications
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	1,361,677		968,650	3,659,627	2,736,838
Industrial
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	443,964		529,229	1,413,021	1,543,841
Impairment of assets held-for-sale		$ (85,000)		(20,000)
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	1,805,641		1,497,879	5,072,648	4,280,679
Segment cost of goods sold and operating expenses	1,389,079		1,178,027	3,928,111	3,399,958
Operating Segments \| Datacenter & Communications
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	1,361,677		968,650	3,659,627	2,736,838
Segment cost of goods sold and operating expenses	1,024,246		745,331	2,766,377	2,101,469
Segment profit	347,610		232,994	923,270	664,812
Operating Segments \| Industrial
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	443,964		529,229	1,413,021	1,543,841
Segment cost of goods sold and operating expenses	364,833		432,696	1,161,734	1,298,489
Segment profit	100,642		114,736	329,039	300,023
Intersegment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	(31,690)		(27,878)	(107,772)	(84,114)
Intersegment \| Datacenter & Communications
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	(10,179)		(9,675)	(30,020)	(29,443)
Intersegment \| Industrial
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ (21,511)		$ (18,203)	$ (77,752)	$ (54,671)

COHERENT CORP. 10-Q