Coherent (COHR) 10-Q5 Feb 252025 Q2 Quarterly reportFinancial data

Company Profile

Cover

Cover - shares	6 Months Ended
Cover - shares	Dec. 31, 2024	Feb. 03, 2025
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Dec. 31, 2024
Document Transition Report	false
Entity File Number	001-39375
Entity Registrant Name	COHERENT CORP.
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	25-1214948
Entity Address, Address Line One	375 Saxonburg Boulevard
Entity Address, Postal Zip Code	16056
Entity Address, City or Town	Saxonburg,
Entity Address, State or Province	PA
City Area Code	724
Local Phone Number	352-4455
Title of 12(b) Security	Common Stock, no par value
Trading Symbol	COHR
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		154,967,323
Amendment Flag	false
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000820318
Current Fiscal Year End Date	--06-30

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Dec. 31, 2024	Jun. 30, 2024
Current Assets
Cash and cash equivalents	$ 917,815	$ 926,033
Restricted cash, current	11,826	174,008
Accounts receivable - less allowance for doubtful accounts of $8,226 at December 31, 2024 and $9,511 at June 30, 2024	891,789	848,542
Inventories	1,344,563	1,286,404
Prepaid and refundable income taxes	24,180	26,909
Prepaid and other current assets	307,269	398,203
Total Current Assets	3,497,442	3,660,099
Property, plant & equipment, net	1,889,578	1,817,259
Goodwill	4,391,055	4,464,329
Other intangible assets, net	3,313,680	3,503,247
Deferred income taxes	53,550	40,966
Restricted cash, non-current	739,001	689,645
Other assets	313,028	313,089
Total Assets	14,197,334	14,488,634
Current Liabilities
Current portion of long-term debt	27,208	73,770
Accounts payable	689,892	631,548
Accrued compensation and benefits	213,534	212,458
Operating lease current liabilities	41,008	40,580
Accrued income taxes payable	99,029	90,705
Other accrued liabilities	238,617	294,706
Total Current Liabilities	1,309,288	1,343,767
Long-term debt	3,832,694	4,026,448
Deferred income taxes	712,798	784,374
Operating lease liabilities	163,309	162,355
Other liabilities	214,031	225,411
Total Liabilities	6,232,120	6,542,355
Mezzanine Equity
Series B redeemable convertible preferred stock, no par value, 5% cumulative; issued - 215,000 shares at December 31, 2024 and June 30, 2024; redemption value - $2,488,935 and $2,427,860, respectively	2,428,867	2,364,772
Shareholders' Equity
Common stock, no par value; authorized - 300,000,000 shares; issued - 171,115,185 shares at December 31, 2024; 168,406,323 shares at June 30, 2024	4,957,079	4,857,657
Accumulated other comprehensive income (loss) (AOCI)	(159,716)	2,640
Retained earnings	730,117	664,940
Shareholders' equity excluding treasury stock	5,527,480	5,525,237
Treasury stock, at cost; 16,171,190 shares at December 31, 2024 and 15,626,740 shares at June 30, 2024	(359,257)	(315,122)
Total Coherent Corp. Shareholders’ Equity	5,168,223	5,210,115
Noncontrolling interests (NCI)	368,124	371,392
Total Equity	5,536,347	5,581,507
Total Liabilities, Mezzanine Equity and Equity	$ 14,197,334	$ 14,488,634

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2024	Jun. 30, 2024
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 8,226	$ 9,511
Redeemable convertible preferred stock, par value (in usd per share)	$ 0	$ 0
Redeemable convertible preferred stock, cumulative percentage	5%	5%
Redeemable convertible preferred stock, shares issued (in shares)	215,000	215,000
Redeemable convertible preferred stock redemption value	$ 2,488,935	$ 2,427,860
Common stock, no par value (in usd per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	171,115,185	168,406,323
Treasury stock (in shares)	16,171,190	15,626,740

Condensed Consolidated Statemen

Condensed Consolidated Statements of Earnings (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Income Statement [Abstract]
Revenues	$ 1,434,665	$ 1,131,434	$ 2,782,800	$ 2,184,517
Costs, Expenses, and Other Expense (Income)
Cost of goods sold	925,314	780,793	1,813,317	1,526,981
Research and development	143,852	111,163	275,454	224,651
Selling, general and administrative	220,612	209,163	449,580	420,860
Restructuring charges (recoveries)	8,021	(1,570)	32,385	1,448
Interest expense	64,278	74,678	130,922	147,936
Other income, net	(55,816)	(5,386)	(66,565)	(11,655)
Total Costs, Expenses, & Other Expense	1,306,261	1,168,841	2,635,093	2,310,221
Earnings (Loss) Before Income Taxes	128,404	(37,407)	147,707	(125,704)
Income Tax Expense (Benefit)	26,862	(8,932)	21,304	(29,695)
Net Earnings (Loss)	101,542	(28,475)	126,403	(96,009)
Net Loss Attributable to Noncontrolling Interests	(1,843)	(1,484)	(2,869)	(1,484)
Net Earnings (Loss) Attributable to Coherent Corp.	103,385	(26,991)	129,272	(94,525)
Less: Dividends on Preferred Stock	32,262	30,580	64,095	60,753
Net Earnings (Loss) Available to the Common Shareholders, Basic	71,123	(57,571)	65,177	(155,278)
Net Earnings (Loss) Available to the Common Shareholders, Diluted	$ 71,123	$ (57,571)	$ 65,177	$ (155,278)
Basic Earnings (Loss) Per Share (in usd per share)	$ 0.46	$ (0.38)	$ 0.42	$ (1.03)
Diluted Earnings (Loss) Per Share (in usd per share)	$ 0.44	$ (0.38)	$ 0.41	$ (1.03)

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net Earnings (Loss)	$ 101,542	$ (28,475)	$ 126,403	$ (96,009)
Other Comprehensive Income (Loss):
Foreign currency translation adjustments	(432,264)	226,788	(141,990)	118,885
Change in fair value of interest rate instruments, net of taxes	(1,426)	(27,329)	(20,181)	(24,391)
Pension adjustment, net of taxes	(429)	57	(584)	348
Comprehensive Income (Loss)	(332,577)	171,041	(36,352)	(1,167)
Comprehensive Loss Attributable to Noncontrolling Interests	(1,843)	(1,484)	(2,869)	(1,484)
Foreign Currency Translation Adjustments Attributable to Noncontrolling Interests	(950)	1,065	(399)	1,065
Comprehensive Income (Loss) Attributable to Coherent Corp.	$ (329,784)	$ 171,460	$ (33,084)	$ (748)

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Change in fair value of interest rate instruments, taxes	$ 2,199	$ (4,397)	$ (7,484)	$ 868	$ (2,198)	$ (6,616)
Pension adjustment, taxes	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Cash Flows from Operating Activities
Net earnings (loss)	$ 126,403	$ (96,009)
Adjustments to reconcile net earnings (loss) to net cash provided by operating activities:
Depreciation	128,627	132,210
Amortization	143,578	144,168
Share-based compensation expense	75,689	72,465
Amortization of debt issuance costs	10,418	8,803
Non-cash restructuring charges	18,370	2,639
Loss on disposal of property, plant and equipment	67	238
Unrealized gains on foreign currency remeasurements and transactions	(9,529)	(1,835)
Loss (earnings) from equity investments	(501)	301
Deferred income taxes	(59,618)	(96,683)
Increase (decrease) in cash from changes in (net of effect of acquisitions):
Accounts receivable	(38,849)	53,428
Inventories	(66,521)	(3,164)
Accounts payable	48,020	62,998
Contract liabilities	(9,845)	(31,451)
Income taxes	8,821	26,877
Accrued compensation and benefits	1,076	11,175
Other operating net assets (liabilities)	(35,847)	(20,189)
Net cash provided by operating activities	340,359	265,971
Cash Flows from Investing Activities
Additions to property, plant & equipment	(197,667)	(153,667)
Proceeds from the sale of business	27,000	0
Other investing activities	(1,126)	(1,978)
Net cash used in investing activities	(171,793)	(155,645)
Cash Flows from Financing Activities
Sale of shares to noncontrolling interests	0	1,000,000
Payments on existing debt	(250,210)	(107,457)
Equity issuance costs	0	(31,840)
Proceeds from exercises of stock options and purchases of stock under employee stock purchase plan	29,234	16,143
Payments in satisfaction of employees' minimum tax obligations	(45,042)	(17,566)
Other financing activities	(455)	(531)
Net cash provided by (used in) financing activities	(266,473)	858,749
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(23,137)	14,049
Net increase (decrease) in cash, cash equivalents, and restricted cash	(121,044)	983,124
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	1,789,686	837,566
Cash, Cash Equivalents, and Restricted Cash at End of Period	1,668,642	1,820,690
Supplemental Information
Cash paid for interest	142,485	159,538
Cash paid for income taxes	66,367	38,142
Additions to property, plant & equipment included in accounts payable	74,368	71,806
Non-Cash Investing and Financing Activities
Conversion of Series A preferred stock to common stock	0	445,319
Reconciliation of Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Cash and cash equivalents	917,815	856,255
Restricted cash, current	11,826	177,077
Restricted cash, non-current	739,001	787,358
Total cash, cash equivalents, and restricted cash shown in the Condensed Consolidated Statements of Cash Flows	$ 1,668,642	$ 1,820,690

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Equity and Mezzanine Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Preferred Stock	AOCI	Retained Earnings	Treasury Stock	NCI
Beginning balance, Common Stock (in shares) at Jun. 30, 2023		154,721,000
Balance-beginning of period at Jun. 30, 2023	$ 4,987,551	$ 3,781,211	$ 445,319	$ 109,726	$ 944,416	$ (293,121)	$ 0
Beginning balance, Preferred Stock (in shares) at Jun. 30, 2023			2,300,000
Beginning balance, Treasury Stock, (in shares) at Jun. 30, 2023						(15,137,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based and deferred compensation (in shares)		1,804,000				366,000
Share-based and deferred compensation	46,816	$ 60,748				$ (13,932)
Conversion of stock and securities (in shares)		10,240,000	(2,300,000)
Conversion of stock and securities	0	$ 445,319	$ (445,319)
Net earnings (loss)	(67,534)				(67,534)
Foreign currency translation adjustments	(107,903)			(107,903)
Change in fair value of interest rate instruments, net of taxes	2,938			2,938
Pension adjustment, net of taxes	291			291
Dividends	(30,173)				(30,173)
Ending balance, Common Stock (in shares) at Sep. 30, 2023		166,765,000
Balance-end of period at Sep. 30, 2023	$ 4,831,986	$ 4,287,278	$ 0	5,052	846,709	$ (307,053)	0
Ending balance, Preferred Stock (in shares) at Sep. 30, 2023			0
Ending balance, Treasury Stock (in shares) at Sep. 30, 2023						(15,503,000)
Beginning balance (in shares) at Jun. 30, 2023	215,000
Beginning balance at Jun. 30, 2023	$ 2,241,415
Increase (Decrease) in Temporary Equity [Roll Forward]
Dividends	$ 30,173
Ending balance (in shares) at Sep. 30, 2023	215,000
Ending balance at Sep. 30, 2023	$ 2,271,588
Beginning balance, Common Stock (in shares) at Jun. 30, 2023		154,721,000
Balance-beginning of period at Jun. 30, 2023	4,987,551	$ 3,781,211	$ 445,319	109,726	944,416	$ (293,121)	0
Beginning balance, Preferred Stock (in shares) at Jun. 30, 2023			2,300,000
Beginning balance, Treasury Stock, (in shares) at Jun. 30, 2023						(15,137,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	(96,009)
Foreign currency translation adjustments	118,885
Change in fair value of interest rate instruments, net of taxes	(24,391)
Pension adjustment, net of taxes	348
Ending balance, Common Stock (in shares) at Dec. 31, 2023		167,309,000
Balance-end of period at Dec. 31, 2023	$ 5,844,056	$ 4,786,076	$ 0	206,374	789,138	$ (310,686)	373,154
Ending balance, Preferred Stock (in shares) at Dec. 31, 2023			0
Ending balance, Treasury Stock (in shares) at Dec. 31, 2023						(15,550,000)
Beginning balance (in shares) at Jun. 30, 2023	215,000
Beginning balance at Jun. 30, 2023	$ 2,241,415
Ending balance (in shares) at Dec. 31, 2023	215,000
Ending balance at Dec. 31, 2023	$ 2,302,168
Beginning balance, Common Stock (in shares) at Sep. 30, 2023		166,765,000
Balance-beginning of period at Sep. 30, 2023	4,831,986	$ 4,287,278	$ 0	5,052	846,709	$ (307,053)	0
Beginning balance, Preferred Stock (in shares) at Sep. 30, 2023			0
Beginning balance, Treasury Stock, (in shares) at Sep. 30, 2023						(15,503,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based and deferred compensation (in shares)		544,000				47,000
Share-based and deferred compensation	21,551	$ 25,184				$ (3,633)
Net earnings (loss)	(28,475)				(26,991)		(1,484)
Foreign currency translation adjustments	226,788			225,723			1,065
Change in fair value of interest rate instruments, net of taxes	(27,329)			(27,329)
Pension adjustment, net of taxes	57			57
Dividends	(30,580)				(30,580)
Sale of shares to noncontrolling interests, net of issuance costs and taxes	850,058	$ 473,614		2,871			373,573
Ending balance, Common Stock (in shares) at Dec. 31, 2023		167,309,000
Balance-end of period at Dec. 31, 2023	$ 5,844,056	$ 4,786,076	$ 0	206,374	789,138	$ (310,686)	373,154
Ending balance, Preferred Stock (in shares) at Dec. 31, 2023			0
Ending balance, Treasury Stock (in shares) at Dec. 31, 2023						(15,550,000)
Beginning balance (in shares) at Sep. 30, 2023	215,000
Beginning balance at Sep. 30, 2023	$ 2,271,588
Increase (Decrease) in Temporary Equity [Roll Forward]
Dividends	$ 30,580
Ending balance (in shares) at Dec. 31, 2023	215,000
Ending balance at Dec. 31, 2023	$ 2,302,168
Beginning balance, Common Stock (in shares) at Jun. 30, 2024		168,408,000
Balance-beginning of period at Jun. 30, 2024	$ 5,581,507	$ 4,857,657	$ 0	2,640	664,940	$ (315,122)	371,392
Beginning balance, Preferred Stock (in shares) at Jun. 30, 2024			0
Beginning balance, Treasury Stock, (in shares) at Jun. 30, 2024	(15,626,740)					(15,629,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based and deferred compensation (in shares)		2,136,000				399,000
Share-based and deferred compensation	$ 26,095	$ 56,015			3	$ (29,923)
Net earnings (loss)	24,861				25,887		(1,026)
Foreign currency translation adjustments	290,274			289,723			551
Change in fair value of interest rate instruments, net of taxes	(18,755)			(18,755)
Pension adjustment, net of taxes	(155)			(155)
Dividends	(31,833)				(31,833)
Ending balance, Common Stock (in shares) at Sep. 30, 2024		170,544,000
Balance-end of period at Sep. 30, 2024	$ 5,871,994	$ 4,913,672	$ 0	273,453	658,997	$ (345,045)	370,917
Ending balance, Preferred Stock (in shares) at Sep. 30, 2024			0
Ending balance, Treasury Stock (in shares) at Sep. 30, 2024						(16,028,000)
Beginning balance (in shares) at Jun. 30, 2024	215,000
Beginning balance at Jun. 30, 2024	$ 2,364,772
Increase (Decrease) in Temporary Equity [Roll Forward]
Dividends	$ 31,833
Ending balance (in shares) at Sep. 30, 2024	215,000
Ending balance at Sep. 30, 2024	$ 2,396,605
Beginning balance, Common Stock (in shares) at Jun. 30, 2024		168,408,000
Balance-beginning of period at Jun. 30, 2024	$ 5,581,507	$ 4,857,657	$ 0	2,640	664,940	$ (315,122)	371,392
Beginning balance, Preferred Stock (in shares) at Jun. 30, 2024			0
Beginning balance, Treasury Stock, (in shares) at Jun. 30, 2024	(15,626,740)					(15,629,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	$ 126,403
Foreign currency translation adjustments	(141,990)
Change in fair value of interest rate instruments, net of taxes	(20,181)
Pension adjustment, net of taxes	(584)
Ending balance, Common Stock (in shares) at Dec. 31, 2024		171,115,000
Balance-end of period at Dec. 31, 2024	$ 5,536,347	$ 4,957,079	$ 0	(159,716)	730,117	$ (359,257)	368,124
Ending balance, Preferred Stock (in shares) at Dec. 31, 2024			0
Ending balance, Treasury Stock (in shares) at Dec. 31, 2024	(16,171,190)					(16,171,000)
Beginning balance (in shares) at Jun. 30, 2024	215,000
Beginning balance at Jun. 30, 2024	$ 2,364,772
Ending balance (in shares) at Dec. 31, 2024	215,000
Ending balance at Dec. 31, 2024	$ 2,428,867
Beginning balance, Common Stock (in shares) at Sep. 30, 2024		170,544,000
Balance-beginning of period at Sep. 30, 2024	5,871,994	$ 4,913,672	$ 0	273,453	658,997	$ (345,045)	370,917
Beginning balance, Preferred Stock (in shares) at Sep. 30, 2024			0
Beginning balance, Treasury Stock, (in shares) at Sep. 30, 2024						(16,028,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based and deferred compensation (in shares)		571,000				143,000
Share-based and deferred compensation	29,192	$ 43,407			(3)	$ (14,212)
Net earnings (loss)	101,542				103,385		(1,843)
Foreign currency translation adjustments	(432,264)			(431,314)			(950)
Change in fair value of interest rate instruments, net of taxes	(1,426)			(1,426)
Pension adjustment, net of taxes	(429)			(429)
Dividends	(32,262)				(32,262)
Ending balance, Common Stock (in shares) at Dec. 31, 2024		171,115,000
Balance-end of period at Dec. 31, 2024	$ 5,536,347	$ 4,957,079	$ 0	$ (159,716)	$ 730,117	$ (359,257)	$ 368,124
Ending balance, Preferred Stock (in shares) at Dec. 31, 2024			0
Ending balance, Treasury Stock (in shares) at Dec. 31, 2024	(16,171,190)					(16,171,000)
Beginning balance (in shares) at Sep. 30, 2024	215,000
Beginning balance at Sep. 30, 2024	$ 2,396,605
Increase (Decrease) in Temporary Equity [Roll Forward]
Dividends	$ 32,262
Ending balance (in shares) at Dec. 31, 2024	215,000
Ending balance at Dec. 31, 2024	$ 2,428,867

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Equity and Mezzanine Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2024	Dec. 31, 2023
Statement of Stockholders' Equity [Abstract]
Change in fair value of interest rate instruments, taxes	$ 2,199	$ (4,397)	$ (7,484)	$ 868	$ (2,198)	$ (6,616)
Pension adjustment, taxes	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0

Basis of Presentation

Basis of Presentation	6 Months Ended
Basis of Presentation	Dec. 31, 2024
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The condensed consolidated financial statements of Coherent Corp. (“Coherent”, the “Company”, “we”, “us” or “our”) for the three and six months ended December 31, 2024 and 2023 are unaudited. In the opinion of management, all adjustments considered necessary for a fair presentation for the periods presented have been included. All adjustments are of a normal recurring nature unless disclosed otherwise. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) have been condensed or omitted. These condensed consolidated financial statements should be read in conjunction with the audited financial statements and notes thereto included in the Company’s Annual Report on Form 10-K dated August 16, 2024. The condensed consolidated results of operations for the three and six months ended December 31, 2024 are not necessarily indicative of the results to be expected for the full fiscal year. The Condensed Consolidated Balance Sheet information as of June 30, 2024 was derived from the Company’s audited consolidated financial statements.

Recently Issued Financial Accou

Recently Issued Financial Accounting Standards	6 Months Ended
Recently Issued Financial Accounting Standards	Dec. 31, 2024
Accounting Policies [Abstract]
Recently Issued Financial Accounting Standards	Recently Issued Financial Accounting Standards In November 2023, the FASB issued Accounting Standards Update (“ASU”) 2023-07 - Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. This ASU improves reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. This ASU is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The Company is evaluating the impact this will have on the Company’s consolidated financial statements and disclosures. In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures” (“ASU 2023-09”). ASU 2023-09 includes amendments that further enhance income tax disclosures, primarily through standardization and disaggregation of rate reconciliation categories and income taxes paid by jurisdiction. ASU 2023-09 is effective for annual periods beginning after December 15, 2024, on either a prospective or retrospective basis. Early adoption is permitted. The Company is currently evaluating the impact of ASU 2023-09 on its consolidated financial statements and related disclosures. In March 2024, the Securities and Exchange Commission (the “SEC”) issued the final rule under SEC Release No. 33-11275 and 34-99678, “The Enhancement and Standardization of Climate-Related Disclosures for Investors,” requiring public companies to provide certain climate-related information in their registration statements and annual reports. The final rules will require information about a company’s climate-related risks that have materially impacted or are reasonably likely to have a material impact on its business strategy, results of operations, or financial condition, and the actual and potential material impacts of any identified climate-related risks on the company’s strategy, business model and outlook, as well as relating to assessment, management, oversight and mitigation of such material risks, material climate-related targets and goals, and material greenhouse gas emissions. Additionally, certain disclosures related to severe weather events and other natural conditions will be required in the audited financial statements. The first phase of the final rule is effective for fiscal years beginning in 2025. Disclosure for prior periods is only required if it was previously disclosed in an SEC filing. On April 4, 2024, the SEC voluntarily stayed implementation of the final rule to facilitate the orderly judicial resolution of pending legal challenges to the rule. We are currently evaluating the impact on our disclosures of adopting this new pronouncement.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
Revenue from Contracts with Customers	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers We believe that disaggregating revenue by end market provides the most relevant information regarding the nature, amount, timing, and uncertainty of revenues and cash flows. The following tables summarize disaggregated revenue by market ($000): Three Months Ended December 31, 2024 Six Months Ended December 31, 2024 Networking Materials Lasers Total Networking Materials Lasers Total Industrial $ 13,851 $ 126,381 $ 297,213 $ 437,445 $ 28,231 $ 246,027 $ 570,127 $ 844,385 Communications 792,862 30,237 — 823,099 1,532,018 65,372 — 1,597,390 Electronics 1,793 76,424 18 78,235 3,964 150,481 18 154,463 Instrumentation 7,407 10,433 78,046 95,886 14,572 19,022 152,968 186,562 Total Revenues $ 815,913 $ 243,475 $ 375,277 $ 1,434,665 $ 1,578,785 $ 480,902 $ 723,113 $ 2,782,800 Three Months Ended December 31, 2023 Six Months Ended December 31, 2023 Networking Materials Lasers Total Networking Materials Lasers Total Industrial $ 14,746 $ 137,128 $ 271,494 $ 423,368 $ 30,711 $ 270,331 $ 526,660 $ 827,702 Communications 499,350 20,984 — 520,334 945,624 34,236 — 979,860 Electronics 1,453 87,279 — 88,732 3,177 175,344 — 178,521 Instrumentation 8,686 8,287 82,027 99,000 17,572 18,407 162,455 198,434 Total Revenues $ 524,235 $ 253,678 $ 353,521 $ 1,131,434 $ 997,084 $ 498,318 $ 689,115 $ 2,184,517 Contract Liabilities

Inventories

Inventories	6 Months Ended
Inventories	Dec. 31, 2024
Inventory Disclosure [Abstract]
Inventories	Inventories The components of inventories were as follows ($000): December 31, June 30, Raw materials $ 386,472 $ 429,888 Work in progress 730,085 620,575 Finished goods 228,006 235,941 Total inventories $ 1,344,563 $ 1,286,404

Property, Plant and Equipment

Property, Plant and Equipment	6 Months Ended
Property, Plant and Equipment	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment consists of the following ($000): December 31, June 30, Land and improvements $ 65,482 $ 66,156 Buildings and improvements 783,840 774,991 Machinery and equipment 2,127,757 2,034,310 Construction in progress 482,502 398,884 Finance lease right-of-use asset 25,000 25,000 3,484,581 3,299,341 Less accumulated depreciation and amortization (1,595,003) (1,482,082) Property, plant, and equipment, net $ 1,889,578 $ 1,817,259

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	6 Months Ended
Goodwill and Other Intangible Assets	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Changes in the carrying amount of goodwill were as follows ($000): Six Months Ended December 31, 2024 Networking Materials Lasers Total Balance-beginning of period $ 1,036,592 $ 245,983 $ 3,181,754 $ 4,464,329 Foreign currency translation (460) 992 (73,806) (73,274) Balance-end of period $ 1,036,132 $ 246,975 $ 3,107,948 $ 4,391,055 We test goodwill for impairment annually during the fourth quarter, or more frequently when events or changes in circumstances indicate that fair value is below carrying value. The gross carrying amount and accumulated amortization of our intangible assets other than goodwill were as follows ($000): December 31, 2024 June 30, 2024 Gross Accumulated Net Gross Accumulated Net Book Value Technology $ 1,635,502 $ (452,308) $ 1,183,194 $ 1,653,289 $ (394,040) $ 1,259,249 Trade Names 438,470 (8,470) 430,000 438,470 (8,470) 430,000 Customer Lists 2,270,524 (572,069) 1,698,455 2,310,550 (498,252) 1,812,298 Backlog and Other 87,459 (85,428) 2,031 88,792 (87,092) 1,700 Total $ 4,431,955 $ (1,118,275) $ 3,313,680 $ 4,491,101 $ (987,854) $ 3,503,247

Debt

Debt	6 Months Ended
Debt	Dec. 31, 2024
Debt Disclosure [Abstract]
Debt	Debt The components of debt as of the dates indicated were as follows ($000): December 31, June 30, Term A Facility, interest at adjusted SOFR, as defined, plus 1.850% $ 679,375 $ 775,625 Debt issuance costs, Term A Facility and Revolving Credit Facility (10,600) (13,586) Term B Facility, interest at adjusted SOFR, as defined, plus 2.500% 2,232,358 2,384,536 Debt issuance costs, Term B Facility (42,882) (49,835) 1.30% Term loan — 335 Facility construction loan in Germany 17,110 19,082 5.000% Senior Notes 990,000 990,000 Debt issuance costs and discount, Senior Notes (5,459) (5,939) Total debt 3,859,902 4,100,218 Current portion of long-term debt (27,208) (73,770) Long-term debt, less current portion $ 3,832,694 $ 4,026,448 Senior Credit Facilities On July 1, 2022 (the “Closing Date”), Coherent entered into a Credit Agreement by and among the Company, as borrower (in such capacity, the “Borrower”), the lenders, and other parties thereto, and JP Morgan Chase Bank, N.A., as administrative agent and collateral agent, which provides for senior secured financing of $4.0 billion, consisting of a term loan A credit facility (the “Term A Facility”) maturing July 1, 2027, with an aggregate principal amount of $850 million, a term loan B credit facility (the “Term B Facility” maturing July 1, 2029 and, together with the Term A Facility, the “Term Facilities”), with an aggregate principal amount of $2,800 million, and a revolving credit facility (the “Revolving Credit Facility”) maturing July 1, 2027, in an aggregate available amount of $350 million, including a letter of credit sub-facility of up to $50 million. On March 31, 2023, Coherent entered into Amendment No. 1 to the Credit Agreement, which replaced the adjusted LIBOR-based rate of interest therein with an adjusted SOFR-based rate of interest. As amended, the Term A Facility and the Revolving Credit Facility each bear interest at an adjusted SOFR rate subject to a 0.10% floor plus a range of 1.75% to 2.50%, based on the Company’s total net leverage ratio. The Term A Facility and the Revolving Credit Facility borrowings bear interest at adjusted SOFR plus 1.85% as of December 31, 2024. On April 2, 2024, Coherent entered into Amendment No. 2 to the Credit Agreement, under which the principal amount of term B loans outstanding under the Credit Agreement (the “Existing Term B Loans”) were replaced with an equal amount of new term loans (the “New Term B Loans”) having substantially similar terms as the Existing Term B Loans, except with respect to the interest rate applicable to the New Term B Loans and certain other provisions. As further amended, the New Term B Loans bear interest at a SOFR rate (subject to a 0.50% floor) plus 2.50% as of December 31, 2024. The maturity of the New Term Loans and revolving credit facility remains unchanged. Debt extinguishment costs related to the replacement of the Existing Term B Loans of $2 million were expensed in Other income, net in the Condensed Consolidated Statement of Earnings (Loss) during the quarter ended June 30, 2024. On January 2, 2025, Coherent entered into Amendment No. 3 to the Credit Agreement, under which the principal amount of term B loans outstanding under the Credit Agreement (the “New Term B Loans”) were replaced with an equal amount of new term loans (the “New Term B-2 Loans”) having substantially similar terms as the New Term B Loans, except with respect to the interest rate applicable to the New Term B-2 Loans and certain other provisions. As further amended, the New Term B-2 Loans will bear interest at a SOFR rate (subject to a 0.50% floor) plus 2.00% as of January 2, 2025. The maturity of the New Term B-2 Loans and revolving credit facility remains unchanged. In relation to the Term Facilities, the Company incurred interest expense, including amortization of debt issuance costs and the benefit of the interest rate cap and swap, of $52 million and $106 million in the three and six months ended December 31, 2024, respectively, and $62 million and $122 million in the three and six months ended December 31, 2023, respectively, which is included in Interest expense in the Condensed Consolidated Statements of Earnings (Loss). On July 1, 2023, our interest rate cap became effective, which together with our interest rate swap (through September 30, 2024), reduced interest expense by $7 million and $21 million during the three and six months ended December 31, 2024, respectively, and $12 million and $23 million in the three and six months ended December 31, 2023, respectively. The amortization of debt issuance costs included in interest expense was $4 million and $9 million in the three and six months ended December 31, 2024, respectively, and $5 million and $8 million in the three and six months ended December 31, 2023, respectively. Debt issuance costs are presented as a reduction to debt within the Long-term debt caption in the Condensed Consolidated Balance Sheets. On the Closing Date, the Borrower and certain of its direct and indirect subsidiaries provided a guaranty of all obligations of the Borrower and the other loan parties under the Credit Agreement and the other loan documents, secured cash management agreements and secured hedge agreements with the lenders and/or their affiliates (subject to certain exceptions). The Borrower and the other guarantors have also granted a security interest in substantially all of their assets to secure such obligations. As of December 31, 2024, the Company was in compliance with all covenants under the Term Facilities. Debt Assumed through Acquisition We assumed the remaining balances of three term loans with the closing of the acquisition of Coherent, Inc. The aggregate principal amount outstanding is $17 million as of December 31, 2024. The term loans assumed consisted of the following: (i) 1.3% Term Loan (repaid prior to December 31, 2024), (ii) 1.0% State of Connecticut Term Loan due 2023 (repaid in fiscal 2023), and (iii) Facility construction loan in Germany. For the Facility construction loan, on December 21, 2020, Coherent LaserSystems GmbH & Co. KG entered into a loan agreement with Commerzbank for borrowings of up to 24 million Euros, which were drawn down by October 29, 2021, to finance a portion of the construction of a new facility in Germany. The term of the loan is 10 years, and borrowings bear interest at 1.55% per annum. Payments are made quarterly. 5.000% Senior Notes due 2029 On December 10, 2021, the Company issued $990 million aggregate principal amount of Senior Notes pursuant to the indenture, dated as of December 10, 2021 (the “Indenture”), between the Company and U.S. Bank National Association, as trustee. The Senior Notes are guaranteed by each of the Company’s domestic subsidiaries that guarantee its obligations under the Senior Credit Facilities. Interest on the Senior Notes is payable on December 15 and June 15 of each year, commencing on June 15, 2022, at a rate of 5.000% per annum. The Senior Notes will mature on December 15, 2029 . On or after December 15, 2024, the Company may redeem the Senior Notes, in whole at any time or in part from time to time, at the redemption prices set forth in the Indenture, plus accrued and unpaid interest, if any, to, but excluding, the applicable redemption date. In addition, at any time prior to December 15, 2024, the Company had the ability to (but did not) redeem the Senior Notes, at its option, in whole at any time or in part from time to time, at a redemption price equal to 100% of the principal amount of the Senior Notes redeemed, plus a “make-whole” premium set forth in the Indenture, plus accrued and unpaid interest, if any, to, but excluding, the applicable redemption date. Notwithstanding the foregoing, at any time and from time to time prior to December 15, 2024, the Company had the ability to (but did not) redeem up to 40% of the aggregate principal amount of the Senior Notes using the proceeds of certain equity offerings as set forth in the Indenture, at a redemption price equal to 105.000% of the principal amount thereof, plus accrued and unpaid interest, if any, to, but excluding, the applicable redemption date. In relation to the Senior Notes, the Company incurred interest expense of $13 million and $25 million in the three and six months ended December 31, 2024, respectively, and $13 million and $25 million in the three and six months ended December 31, 2023, respectively, which is included in Interest expense in the Condensed Consolidated Statements of Earnings (Loss). The Indenture contains customary covenants and events of default, including default relating to, among other things, payment default, failure to comply with covenants or agreements contained in the Indenture or the Senior Notes and certain provisions related to bankruptcy events. As of December 31, 2024, the Company was in compliance with all covenants under the Indenture. Aggregate Availability The Company had aggregate availability of $319 million under its Revolving Credit Facility as of December 31, 2024.

Income Taxes

Income Taxes	6 Months Ended
Income Taxes	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s year-to-date effective income tax rate was 14% at December 31, 2024 compared to 24% for the period ending December 31, 2023. The difference between the Company’s effective tax rate and the U.S. statutory rate of 21% is primarily due to a discrete benefit relating to share-based compensation and tax rate differentials between U.S. and foreign jurisdictions. U.S. GAAP prescribes the accounting for uncertainty in income taxes recognized in an enterprise’s financial statements which includes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. As of December 31, 2024 and June 30, 2024, the Company’s gross unrecognized tax benefit, excluding interest and penalties, was $115 million and $117 million, respectively. The Company has classified the uncertain tax positions as non-current income tax liabilities, as the amounts are not expected to be paid within one year. Due to the U.S. valuation allowance, a large portion of the gross unrecognized tax benefit will not impact the tax rate if recognized. As of December 31, 2024, $19 million of the gross unrecognized tax benefit would impact the effective tax rate if recognized. The Company recognizes interest and penalties related to uncertain tax positions in the income tax provision in the Condensed Consolidated Statements of Earnings (Loss). The amount of accrued interest and penalties included in the gross unrecognized income tax benefit was $9 million and $7 million at December 31, 2024 and June 30, 2024, respectively. Fiscal years 2018 and 2020 to 2023 remain open to examination by the Internal Revenue Service, fiscal years 2019 to 2023 remain open to examination by certain state jurisdictions, and fiscal years 2012 to 2023 remain open to examination by certain foreign taxing jurisdictions. The Company is currently under examination for certain subsidiary companies in Vietnam for the years ended June 30, 2017 through September 30, 2021; Singapore for the year ended September 30, 2020; Spain for the years ended September 30, 2020 through September 30, 2022; Malaysia for the years ended June 30, 2021 through June 30, 2023; and Germany for the years ended June 30, 2012 through June 30, 2021. The Company believes its income tax reserves for these tax matters are adequate.

Leases

Leases	6 Months Ended
Leases	Dec. 31, 2024
Leases [Abstract]
Leases	Leases We determine if an arrangement is a lease at inception for arrangements with an initial term of more than 12 months, and classify it as either finance or operating. Finance leases are generally those that allow us to substantially utilize or pay for the entire asset over its estimated useful life. Finance lease assets are recorded in Property, plant and equipment, net, and finance lease liabilities within Other accrued liabilities Other liabilities Operating leases are leases that do not qualify as finance leases and are recorded in Other assets and Operating lease liabilities, current and non-current on our Condensed Consolidated Balance Sheets. Operating lease assets are amortized on a straight-line basis in operating expenses over the lease term. Our lease liabilities are recognized based on the present value of the remaining fixed lease payments, over the lease term, using a discount rate of similarly secured borrowings available to the Company. For the purpose of lease liability measurement, we consider only payments that are fixed and determinable at the time of commencement. Any variable payments that depend on an index or rate are expensed as incurred. We account for non-lease components, such as common area maintenance, as a component of the lease, and include it in the initial measurement of our leased assets and corresponding liabilities. Our lease terms and conditions may include options to extend or terminate. An option is recognized when it is reasonably certain that we will exercise that option. Our lease assets also include any lease payments made, and exclude any lease incentives received prior to commencement. Our lease assets are tested for impairment in the same manner as long-lived assets used in operations. The following table presents lease costs, which include leases for arrangements with an initial term of more than 12 months, lease term, and discount rates ($000): Three Months Ended December 31, 2024 Six Months Ended Finance lease cost Amortization of right-of-use assets $ 417 $ 833 Interest on lease liabilities 240 486 Total finance lease cost 657 1,319 Operating lease cost 14,095 28,354 Total lease cost $ 14,752 $ 29,673 Cash Paid for Amounts Included in the Measurement of Lease Liabilities Operating cash flows from finance leases $ 240 $ 246 Operating cash flows from operating leases 13,918 27,572 Financing cash flows from finance leases 425 462 Weighted-Average Remaining Lease Term (in Years) Finance leases 7.0 Operating leases 6.7 Weighted-Average Discount Rate Finance leases 5.6 % Operating leases 7.0 % Three Months Ended Six Months Ended Finance Lease Cost Amortization of right-of-use assets $ 417 $ 833 Interest on lease liabilities 263 531 Total finance lease cost $ 680 $ 1,364 Operating lease cost 12,764 25,707 Total lease cost $ 13,444 $ 27,071 Cash Paid for Amounts Included in the Measurement of Lease Liabilities Operating cash flows from finance leases $ 263 $ 531 Operating cash flows from operating leases 12,264 24,539 Financing cash flows from finance leases 384 763
Leases	Leases We determine if an arrangement is a lease at inception for arrangements with an initial term of more than 12 months, and classify it as either finance or operating. Finance leases are generally those that allow us to substantially utilize or pay for the entire asset over its estimated useful life. Finance lease assets are recorded in Property, plant and equipment, net, and finance lease liabilities within Other accrued liabilities Other liabilities Operating leases are leases that do not qualify as finance leases and are recorded in Other assets and Operating lease liabilities, current and non-current on our Condensed Consolidated Balance Sheets. Operating lease assets are amortized on a straight-line basis in operating expenses over the lease term. Our lease liabilities are recognized based on the present value of the remaining fixed lease payments, over the lease term, using a discount rate of similarly secured borrowings available to the Company. For the purpose of lease liability measurement, we consider only payments that are fixed and determinable at the time of commencement. Any variable payments that depend on an index or rate are expensed as incurred. We account for non-lease components, such as common area maintenance, as a component of the lease, and include it in the initial measurement of our leased assets and corresponding liabilities. Our lease terms and conditions may include options to extend or terminate. An option is recognized when it is reasonably certain that we will exercise that option. Our lease assets also include any lease payments made, and exclude any lease incentives received prior to commencement. Our lease assets are tested for impairment in the same manner as long-lived assets used in operations. The following table presents lease costs, which include leases for arrangements with an initial term of more than 12 months, lease term, and discount rates ($000): Three Months Ended December 31, 2024 Six Months Ended Finance lease cost Amortization of right-of-use assets $ 417 $ 833 Interest on lease liabilities 240 486 Total finance lease cost 657 1,319 Operating lease cost 14,095 28,354 Total lease cost $ 14,752 $ 29,673 Cash Paid for Amounts Included in the Measurement of Lease Liabilities Operating cash flows from finance leases $ 240 $ 246 Operating cash flows from operating leases 13,918 27,572 Financing cash flows from finance leases 425 462 Weighted-Average Remaining Lease Term (in Years) Finance leases 7.0 Operating leases 6.7 Weighted-Average Discount Rate Finance leases 5.6 % Operating leases 7.0 % Three Months Ended Six Months Ended Finance Lease Cost Amortization of right-of-use assets $ 417 $ 833 Interest on lease liabilities 263 531 Total finance lease cost $ 680 $ 1,364 Operating lease cost 12,764 25,707 Total lease cost $ 13,444 $ 27,071 Cash Paid for Amounts Included in the Measurement of Lease Liabilities Operating cash flows from finance leases $ 263 $ 531 Operating cash flows from operating leases 12,264 24,539 Financing cash flows from finance leases 384 763

Equity and Redeemable Preferred

Equity and Redeemable Preferred Stock	6 Months Ended
Equity and Redeemable Preferred Stock	Dec. 31, 2024
Equity [Abstract]
Equity and Redeemable Preferred Stock	Equity and Redeemable Preferred Stock As of December 31, 2024, the Company’s amended and restated articles of incorporation authorize our board of directors, without the approval of our shareholders, to issue 5 million shares of our preferred stock. As of December 31, 2024, 2.3 million shares of mandatory preferred convertible shares have been authorized, none are outstanding; 75,000 shares of Series B-1 convertible preferred stock, no par value, have been issued and are outstanding; and 140,000 shares of Series B-2 convertible preferred stock, no par value, have been issued and are outstanding. Mandatory Convertible Preferred Stock In July 2020, the Company issued 2.3 million shares of Mandatory Convertible Preferred Stock. All outstanding shares of Mandatory Convertible Preferred Stock were converted to 10,240,290 shares of Company Common Stock on July 3, 2023, at a conversion ratio of 4.4523, and no shares of Mandatory Convertible Preferred Stock are currently issued and outstanding. Series B Convertible Preferred Stock In March 2021, the Company issued 75,000 shares of Series B-1 Convertible Preferred Stock, no par value per share (“Series B-1 Preferred Stock”), for $10,000 per share, resulting in an aggregate purchase price of $750 million. On July 1, 2022, the Company issued 140,000 shares of Series B-2 Convertible Preferred Stock, no par value per share (“Series B-2 Preferred Stock” and, together with the Series B-1 Preferred Stock, the “Series B Preferred Stock”), for $10,000 per share and an aggregate purchase price of $1.4 billion. The shares of Series B Preferred Stock are convertible into shares of Coherent Common Stock as follows: • at the election of the holder, at an initial conversion price of $85 per share (as it may be adjusted from time to time, the “Conversion Price”) upon the delivery by Coherent to the holders of the Series B Preferred Stock of an offer to repurchase the Series B-1 Preferred Stock upon the occurrence of a Fundamental Change (as defined in the Statement with Respect to Shares establishing the Series B Preferred Stock as defined below); and • at the election of the Company, any time following March 31, 2024 and July 1, 2025 for the Series B-1 and B-2 Preferred Stock, respectively, at the then-applicable Conversion Price if the volume-weighted average price of Coherent Common Stock exceeds 150% of the then-applicable Conversion Price for 20 trading days out of any 30 consecutive trading days. The issued shares of Series B Preferred Stock currently have voting rights, voting as one class with the Coherent Common Stock, on an as-converted basis, subject to limited exceptions. On or at any time after March 31, 2031 and July 1, 2032 for the Series B-1 and B-2 Preferred Stock, respectively: • each holder has the right to require the Company to redeem all of their Coherent Series B Preferred Stock, for cash, at a redemption price per share equal to the sum of the Stated Value (as defined in the Statement with Respect to Shares establishing the Series B Preferred Stock) for such shares plus an amount equal to all accrued or declared and unpaid dividends on such shares that had not previously been added to the Stated Value (such price the “Redemption Price,” and such right the “Put Right”); and • the Company has the right to redeem, in whole or in part, on a pro rata basis from all holders based on the aggregate number of shares of Series B Preferred Stock outstanding, for cash, at the Redemption Price. In connection with any Fundamental Change (as defined in the Statement with Respect to Shares establishing the Series B Preferred Stock), and subject to the procedures set forth in the Statement with Respect to Shares establishing the Series B Preferred Stock, the Company must, or will cause the survivor of a Fundamental Change to, make an offer to repurchase, at the option and election of the holder thereof, each share of Series B Preferred Stock then-outstanding at a purchase price per share in cash equal to (i) the Stated Value for such shares plus an amount equal to all accrued or declared and unpaid dividends on such shares that had not previously been added to the Stated Value as of the date of repurchase plus (ii) if prior to March 31, 2026 and July 1, 2027, for the Series B-1 and B-2 Preferred Stock, respectively, the aggregate amount of all dividends that would have been paid (subject to certain exceptions), from the date of repurchase through March 31, 2026 and July 1, 2027, for the Series B-1 and B-2 Preferred Stock, respectively. If the Company defaults on a payment obligation with respect to the Series B Preferred Stock and such default is not cured within 30 days, the dividend rate will increase to 8% per annum and will be increased by an additional 2% per annum each quarter the Company remains in default, not to exceed 14% per annum. The Series B Preferred Stock is redeemable for cash outside of the control of the Company upon the exercise of the Put Right, and upon a Fundamental Change, and is therefore classified as mezzanine equity. The Series B Preferred Stock is initially measured at fair value less issuance costs, accreted to its redemption value over a 10-year period (using the effective interest method) with such accretion accounted for as deemed dividends and reductions to Net Earnings (Loss) Available to Common Shareholders. Preferred stock dividends are presented as a reduction to Retained earnings on the Condensed Consolidated Balance Sheets. The following table presents dividends per share and dividends recognized: Three Months Ended Six Months Ended 2024 2023 2024 2023 Dividends per share $ 150 $ 142 $ 298 $ 283 Dividends ($000) 30,727 29,235 61,075 58,109 Deemed dividends ($000) 1,535 1,345 3,020 2,644

Noncontrolling Interests

Noncontrolling Interests	6 Months Ended
Noncontrolling Interests	Dec. 31, 2024
Noncontrolling Interest [Abstract]
Noncontrolling Interests	Noncontrolling Interests On December 4, 2023, Silicon Carbide LLC (“Silicon Carbide”), one of the Company’s subsidiaries, completed (i) the sale of 16,666,667 Class A Common Units to Denso Corporation (“Denso”) for $500,000,000 pursuant to an Investment Agreement, dated as of October 10, 2023, by and between Silicon Carbide and Denso and (ii) the sale of 16,666,667 Class A Common units to Mitsubishi Electric Corporation (“MELCO”) for $500,000,000 pursuant to an Investment Agreement, dated as of October 10, 2023, by and between Silicon Carbide and MELCO (collectively, the “Equity Investments”). As a consequence of the Equity Investments, the Company’s ownership interest in the Class A Common Units of Silicon Carbide LLC was reduced to approximately 75%. Denso and MELCO each, individually, own approximately 12.5% of the Class A Common Units of Silicon Carbide. The Equity Investments in Silicon Carbide enables Coherent to increase its available free cash flow to provide greater financial and operational flexibility to execute its capital allocation priorities, as the aggregate $1 billion investment, net of transaction costs, will be used to fund future capital expansion of Silicon Carbide. The following table presents the activity in noncontrolling interests in Silicon Carbide ($000s): Six Months Ended December 31, 2024 2023 Balance-beginning of period $ 371,392 $ — Sale of shares to noncontrolling interests — 373,573 Share of foreign currency translation adjustments (399) 1,065 Net loss (2,869) (1,484) Balance-end of period $ 368,124 $ 373,154

Earnings (Loss) Per Share

Earnings (Loss) Per Share	6 Months Ended
Earnings (Loss) Per Share	Dec. 31, 2024
Earnings Per Share [Abstract]
Earnings (Loss) Per Share	Earnings (Loss) Per Share Basic earnings (loss) per common share is computed by dividing net earnings (loss) available to the common shareholders by the weighted-average number of shares of common stock outstanding during the period. Diluted earnings (loss) per common share is computed by dividing the diluted earnings (loss) available to the common shareholders by the weighted-average number of shares of common stock and potentially dilutive shares of common stock outstanding during the period. The dilutive effect of equity awards is calculated based on the average stock price for each fiscal period, using the treasury stock method. For the three and six months ended December 31, 2024, diluted shares outstanding include the dilutive effect of the potential shares of Coherent Common Stock issuable from performance and restricted shares. For the three and six months ended December 31, 2023, as the Company was in a net loss position, there were no dilutive shares. Potentially dilutive shares whose effect would have been anti-dilutive are excluded from the computation of diluted earnings (loss) per common share. For the three and six months ended December 31, 2024, diluted earnings per share excluded the potentially dilutive effect of the shares of Coherent Common Stock issuable upon conversion of the Series B Convertible Preferred Stock (under the If-Converted method), as their effects were anti-dilutive. For the three and six months ended December 31, 2023, diluted earnings (loss) per share excluded the potentially dilutive effect of the performance and restricted shares, calculated based on the average stock price for each fiscal period, using the treasury stock method, as well as the shares of Coherent Common Stock issuable upon conversion of the Series B Convertible Preferred Stock (under the If-Converted method), as their effects were anti-dilutive. The following is a reconciliation of the numerators and denominators of the basic and diluted earnings (loss) per share computations (000, except per share data): Three Months Ended Six Months Ended 2024 2023 2024 2023 Numerator Net earnings (loss) attributable to Coherent Corp. $ 103,385 $ (26,991) $ 129,272 $ (94,525) Deduct Series B dividends and deemed dividends (32,262) (30,580) (64,095) (60,753) Basic earnings (loss) available to common shareholders $ 71,123 $ (57,571) $ 65,177 $ (155,278) Diluted earnings (loss) available to common shareholders $ 71,123 $ (57,571) $ 65,177 $ (155,278) Denominator Weighted average shares 154,767 151,564 154,197 150,946 Effect of dilutive securities: Common stock equivalents 5,222 — 5,078 — Diluted weighted average common shares 159,989 151,564 159,275 150,946 Basic earnings (loss) per common share $ 0.46 $ (0.38) $ 0.42 $ (1.03) Diluted earnings (loss) per common share $ 0.44 $ (0.38) $ 0.41 $ (1.03) The following table presents potential shares of common stock excluded from the calculation of diluted net earnings (loss) per share, as their effect would have been anti-dilutive (000): Three Months Ended Six Months Ended 2024 2023 2024 2023 Common stock equivalents — 1,956 5 2,146 Series B Convertible Preferred Stock 28,920 27,516 28,741 27,346 Total anti-dilutive shares 28,920 29,472 28,746 29,492

Segment Reporting

Segment Reporting	6 Months Ended
Segment Reporting	Dec. 31, 2024
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting The Company reports its business segments using the “management approach” model for segment reporting. This means that we determine our reportable business segments based on the way the chief operating decision-maker (“CODM”) analyzes business segments within the Company for making operating decisions and assessing financial performance. We report our financial results in the following three segments: (i) Networking, (ii) Materials, and (iii) Lasers. Our CODM receives and reviews financial information based on these three segments. During the first quarter of fiscal 2025 as a result of a new CEO joining the Company in the fourth quarter of fiscal 2024, our CODM implemented changes in the measure he uses to allocate resources and assess performance. Our CODM now evaluates each segment’s performance and allocates resources based on segment revenue and segment profit, instead of operating income, as our CODM believes segment profit is a more comprehensive profitability measure for each operating segment. Segment profit includes operating expenses directly managed by operating segments, including research and development, direct sales, marketing and administrative expenses. Segment profit does not include share-based compensation, acquisition or integration related costs, amortization and impairment of acquisition-related intangible assets, restructuring charges, and certain other charges. Additionally, effective the first quarter of fiscal 2025, we no longer allocate Corporate strategic research and development, strategic marketing and sales expenses and shared general and administrative expenses, as these expenses are not directly attributable to our operating segments. The segments are managed separately due to the market, production requirements and facilities unique to each segment. The accounting policies are consistent across each segment. Effective the first quarter of fiscal 2025, we no longer allocate corporate assets to the segments. Comparative prior period segment information has been recast to conform to the new segment profitability measure. The change in our operating segment measure had no impact on our previously reported consolidated results of operations, financial condition, or cash flows. The following table summarizes selected financial information of our operations by segment and reconciles segment profit to consolidated earnings (loss) before income taxes for the periods presented ($000): Three Months Ended Six Months Ended 2024 2023 2024 2023 Segment revenue Networking $ 815,913 $ 524,235 1,578,785 997,084 Materials 243,475 253,678 480,902 498,318 Lasers 375,277 353,521 723,113 689,115 Total segment revenue 1,434,665 1,131,434 2,782,800 2,184,517 Intersegment revenue Networking 12,584 9,979 27,011 22,866 Materials 119,122 96,042 251,290 183,784 Lasers 2,318 1,205 3,882 1,844 Unallocated (134,024) (107,226) (282,183) (208,494) Total intersegment revenue — — — — Segment profit Networking 153,269 95,350 289,175 156,063 Materials 74,117 56,220 165,225 106,322 Lasers 87,520 62,548 151,259 108,241 Total segment profit 314,906 214,118 605,659 370,626 Unallocated Corporate items Corporate and centralized function costs (1) (49,959) (61,669) (123,061) (107,204) Share-based compensation (41,012) (27,252) (76,490) (71,776) Restructuring costs (2) (8,021) 1,570 (32,385) (1,448) Integration, site consolidated and other costs (3) (7,332) (23,376) (18,081) (35,454) Amortization of intangibles (71,716) (71,507) (143,578) (144,168) Interest expense (64,278) (74,678) (130,922) (147,936) Other (income) expense, net 55,816 5,387 66,565 11,656 Earnings (loss) before income taxes $ 128,404 $ (37,407) $ 147,707 $ (125,704) Expenditures for property, plant, and equipment Networking $ 70,211 $ 36,374 $ 118,897 $ 53,867 Materials 30,703 54,511 64,499 95,023 Lasers 4,769 585 14,271 4,777 Total expenditures for property, plant, and equipment $ 105,683 $ 91,470 $ 197,667 $ 153,667 (1) We do not allocate corporate and centralized function costs that are not directly attributable to our operating segments. (2) See Note 17. Restructuring Plan for further information. (3) Integration and site consolidation costs in the three and six months ended December 31, 2024 includes $4 million and $15 million, respectively, in consulting costs related to projects to integrate recent acquisitions into common technology systems and simplify legal entity structure, and $3 million and $2 million, respectively, of employee severance and retention costs related to sites being shut down as part of our 2023 Restructuring Plan or Synergy and Site Consolidation Plan. Integration and site consolidation costs in the three and six months ended December 31, 2023 primarily include $16 million and $23 million, respectively, in consulting costs related to projects to integrate recent acquisitions into common technology systems and simplify legal entity structure, and $4 million and $6 million, respectively, of employee severance and retention costs related to sites being shut down as part of our 2023 Restructuring Plan or Synergy and Site Consolidation Plan. The following table summarizes segment assets ($000): Segment assets and reconciliation to total assets December 31, June 30, Networking $ 3,545,700 $ 3,472,866 Materials 2,862,533 3,017,858 Lasers 7,062,988 7,361,731 Corporate and shared services 726,113 636,179 Total assets $ 14,197,334 $ 14,488,634

Share-Based Compensation

Share-Based Compensation	6 Months Ended
Share-Based Compensation	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Share-Based Compensation	Share-Based Compensation Stock Award Plans The Company’s Board of Directors amended and restated the Coherent Corp. Omnibus Incentive Plan and the Company’s shareholders approved such amendment and restatement at the Annual Meeting in November 2024 (as amended and restated, the “Plan”). The Plan was originally approved by the Company's shareholders at the Annual Meeting in November 2018, and was subsequently amended, restated and approved by the Company’s shareholders at the Annual Meetings held in November 2020 and November 2023. The Plan provides for the grant of stock options, stock appreciation rights, restricted shares, restricted share units, deferred shares, performance shares and performance units to employees (including officers), consultants and directors of the Company. On June 3, 2024, the Board of Directors granted 147,214 restricted stock units vesting over three years from date of grant and 694,007 performance stock units vesting over the approximate three-year period ending June 30, 2027, to the new CEO. The grants were non-Plan “employment inducement awards” as contemplated by the New York Stock Exchange Listing Rule 303A.08 and therefore were not made pursuant to the Plan. On October 11, 2024, the Board of Directors granted 15,902 and 63,154 restricted stock units vesting over three years and two years, respectively, from date of grant and 118,853 performance stock units vesting over the approximate three-year period ending June 30, 2027, to the new CFO. The grants were non-Plan “employment inducement awards” as contemplated by the New York Stock Exchange Listing Rule 303A.08 and therefore were not made pursuant to the Plan. The Company has an Employee Stock Purchase Plan whereby eligible employees may authorize payroll deductions (subject to certain limitations) of up to 15% (or such lesser amount as may be determined by the plan administrator) of their wages and base salary to purchase shares at an amount which will not be less than 85% of the lower of (i) the fair market value of the common stock on the first trading day of the offering period and (ii) the fair market value of the common stock on the last trading day of the approximately six-month offering period. Share-based compensation expense for the periods indicated was as follows ($000): Three Months Ended Six Months Ended 2024 2023 2024 2023 Stock Options and Cash-Based Stock Appreciation Rights $ 166 $ 803 $ 583 $ (254) Restricted Share Awards and Cash-Based Restricted Share Unit Awards 23,881 20,923 47,650 51,988 Performance Share Awards and Cash-Based Performance Share Unit Awards 14,757 2,985 23,749 13,830 Employee Stock Purchase Plan 2,208 2,541 4,508 6,212 $ 41,012 $ 27,252 $ 76,490 $ 71,776

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
Fair Value of Financial Instruments	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments The FASB defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous markets for the asset and liability in an orderly transaction between market participants at the measurement date. We estimate fair value of our financial instruments utilizing an established three-level hierarchy in accordance with U.S. GAAP. The hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date as follows: • Level 1 – Valuation is based upon unadjusted quoted prices for identical assets or liabilities in active markets. • Level 2 – Valuation is based upon quoted prices for similar assets and liabilities in active markets, or other inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instruments. • Level 3 – Valuation is based upon other unobservable inputs that are significant to the fair value measurements. The classification of fair value measurements within the hierarchy is based upon the lowest level of input that is significant to the measurement. We had entered into an interest rate swap agreement, effective November 24, 2019, with a notional amount of $1,075 million to limit the exposure to our variable interest rate debt by effectively converting it to a fixed interest rate. Through February 28, 2023, we received payments based on the one-month LIBOR and made payments based on a fixed rate of 1.52%. We received payments with a floor of 0.00%. The initial notional amount of the interest rate swap decreased to $825 million in June 2022, and remained at that amount through its expiration on September 24, 2024. On March 20, 2023, we amended our $825 million interest rate swap (“Amended Swap”), effective as of February 28, 2023, to replace the current reference rate (LIBOR) with SOFR, to be consistent with Amendment No. 1 to the Credit Agreement. See Note 7. Debt for further information. Under the Amended Swap, we received payments based on the one-month SOFR and made payments based on a fixed rate of 1.42%. Through its expiration on September 24, 2024, we received payments with a floor of 0.10%. We designated this instrument as a cash flow hedge, and deemed the hedge relationship effective at inception of the contract and the amended contract. The interest rate swap expired on September 30, 2024. The fair value of the interest rate swap of $8 million is recognized in the Condensed Consolidated Balance Sheet within Prepaid and other current assets On February 23, 2022, we entered into an interest rate cap (the “Cap”) with an effective date of July 1, 2023. On March 20, 2023, we amended the Cap to replace the current reference rate (LIBOR) with SOFR, to be consistent with Amendment No. 1 to the Credit Agreement. See Note 7. Debt for further information. The Cap manages our exposure to interest rate movements on a portion of our floating rate debt. The Cap provides us with the right to receive payment if one-month SOFR exceeds 1.92%. Beginning in July 2023, we began to pay a fixed monthly premium based on an annual rate of 0.853% for the Cap. The Cap will carry a notional amount ranging from $500 million to $1,500 million. On September 1, 2024, we increased the notional amount from $500 million to $1,500 million. The fair value of the interest rate cap of $32 million and $50 million is recognized in the Condensed Consolidated Balance Sheet within Prepaid and other current assets Other assets The Cap, as amended, is designed to mirror the terms of the Credit Agreement as amended on March 31, 2023. We designated the Cap as a cash flow hedge of the variability of the SOFR based interest payments on the Term Facilities. Every period over the life of the hedging relationship, the entire change in fair value related to the hedging instrument will first be recorded within Accumulated other comprehensive income (loss). Amounts accumulated in accumulated other comprehensive income (loss) are reclassified into interest expense in the same period or periods in which interest expense is recognized on the Credit Agreement, or its direct replacement. The fair value of the Cap is determined using widely accepted valuation techniques and reflects the contractual terms of the Cap including the period to maturity, and while there are no quoted prices in active markets, it uses observable market-based inputs, including interest rate curves. The fair value analysis also considers a credit valuation adjustment to reflect nonperformance risk of both the Company and the single counterparty. The Cap is classified as a Level 2 item within the fair value hierarchy. We estimated the fair value of the Senior Notes, Term A Facility and Term B Facility (“Debt Facilities”) based on quoted market prices as of the last trading day prior to December 31, 2024; however, the Debt Facilities have only a limited trading volume and as such this fair value estimate is not necessarily the value at which the Debt Facilities could be retired or transferred. We concluded that this fair value measurement should be categorized within Level 2. The carrying values of the Debt Facilities are net of unamortized discount and issuance costs. See Note 7. Debt for details on the Company’s debt facilities. The fair value and carrying value of the Debt Facilities were as follows ($000): December 31, 2024 June 30, 2024 Fair Value Carrying Value Fair Value Carrying Value Senior Notes $ 947,093 $ 984,541 $ 938,193 $ 984,061 Term A Facility 682,772 672,923 777,564 762,039 Term B Facility 2,249,101 2,189,476 2,390,497 2,334,701 Our borrowings, including our lease obligations and the Debt Facilities, are considered Level 2 among the fair value hierarchy. Cash and cash equivalents are considered Level 1 among the fair value hierarchy and approximate fair value because of the short-term maturity of those investments. At December 31, 2024, total restricted cash of $751 million includes $748 million of cash in Silicon Carbide LLC that is restricted for use only by that subsidiary and $3 million of cash restricted for other purposes in other entities. At June 30, 2024, total restricted cash of $864 million includes $858 million of cash in Silicon Carbide LLC that is restricted for use only by that subsidiary and $5 million of cash restricted for other purposes in other entities. The restricted cash is invested in money market accounts and time deposits, with maturities of one year or less, that are held-to-maturity, are considered Level 1 among the fair value hierarchy and approximate fair value. Restricted cash that is expected to be spent and released from restriction after 12 months is classified as non-current on the Condensed Consolidated Balance Sheets. We, from time to time, purchase foreign currency forward exchange contracts that permit us to sell specified amounts of these foreign currencies for pre-established U.S. dollar amounts at specified dates that represent assets or liabilities on the balance sheets of certain subsidiaries. These contracts are entered into for the purpose of limiting translational exposure to changes in currency exchange rates and which otherwise would expose our earnings, on the revaluation of our aggregate net assets or liabilities in respective currencies, to foreign currency risk. At December 31, 2024, we had no foreign currency forward contracts. The fair values of these instruments, when outstanding, are measured using valuations based upon quoted prices for similar assets and liabilities in active markets (Level 2) and are valued by reference to similar financial instruments, adjusted for credit risk and restrictions and other terms specific to the contracts. Realized gains related to these contracts for the three and six months ended December 31, 2024 were zero and $16 million, respectively, and realized gains related to these contracts for the three and six months ended December 31, 2023 were $14 million and $3 million, respectively, were included in Other income, net in the Condensed Consolidated Statements of Earnings (Loss).

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	6 Months Ended
Accumulated Other Comprehensive Income (Loss)	Dec. 31, 2024
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The changes in AOCI by component, net of tax, for the six months ended December 31, 2024 were as follows ($000): Foreign Interest Rate Instruments Defined Total AOCI - June 30, 2024 $ (26,092) $ 35,916 $ (7,184) $ 2,640 Other comprehensive loss before reclassifications (141,591) (1,695) (584) (143,870) Amounts reclassified from AOCI — (18,486) — (18,486) Net current-period other comprehensive loss (141,591) (20,181) (584) (162,356) AOCI - December 31, 2024 $ (167,683) $ 15,735 $ (7,768) $ (159,716)

Restructuring Plan

Restructuring Plan	6 Months Ended
Restructuring Plan	Dec. 31, 2024
Restructuring and Related Activities [Abstract]
Restructuring Plan	Restructuring Plan Restructuring Plan On May 23, 2023, the Board of Directors approved the Company’s May 2023 Restructuring Plan which includes site consolidations, facilities moves and closures, as well as the relocation and requalification of certain manufacturing facilities. These restructuring actions are expected to be accompanied by other cost reductions, and are intended to realign our cost structure as part of a transformation to a simpler, more streamlined, resilient and sustainable business model. We evaluate restructuring charges in accordance with ASC 420, Exit or Disposal Cost Obligations (ASC 420), and ASC 712, Compensation-Nonretirement Post-Employment Benefits (ASC 712). In the three months ended December 31, 2024, these activities resulted in $8 million of charges primarily for site move costs, employee termination costs and accelerated depreciation. In the six months ended December 31, 2024, these activities resulted in $32 million of charges primarily for impairment losses associated with the sale of our Newton Aycliffe business, accelerated depreciation, employee termination and site move costs. In the three months ended December 31, 2023, these activities resulted in $2 million of net recoveries primarily for adjustments to employee termination costs partially offset by acceleration of depreciation and site move costs . In the six months ended December 31, 2023, these activities resulted in $1 million of charges primarily for employee termination costs as well as site move costs, write-off of property and equipment and acceleration of depreciation. We expect the restructuring actions to be substantially completed by the end of fiscal 2025. However, the actual timing and costs associated with these restructuring actions may differ from our current expectations and estimates and such differences may be material. Activity and accrual balances for the Restructuring Plan were as follows for the first two quarters of fiscal 2024 and 2023 ($000): Severance Asset Write-Offs Other Total Accrual Balance - June 30, 2024 $ 51,061 $ — $ — $ 51,061 Restructuring charges (recoveries) (455) 15,970 8,850 24,365 Payments (6,796) — — (6,796) Asset write-offs and other — (15,970) (8,850) (24,820) Balance - September 30, 2024 43,810 $ — $ — $ 43,810 Restructuring charges 2,882 — 5,139 8,021 Payments (752) — — (752) Asset write-offs and other (1,609) — (5,139) (6,748) Balance - December 31, 2024 $ 44,331 $ — $ — $ 44,331 Severance Asset Write-Offs Other Total Accrual Balance - June 30, 2023 $ 64,379 $ — $ — $ 64,379 Restructuring charges 2,050 269 699 3,018 Payments (7,930) — — (7,930) Asset write-offs and other — (269) (699) (968) Balance - September 30, 2023 58,499 — — 58,499 Restructuring charges (recoveries) (4,848) 54 3,224 (1,570) Payments (2,103) — — (2,103) Asset write-offs and other — (54) (3,224) (3,278) Balance - December 31, 2023 $ 51,548 $ — $ — $ 51,548 At December 31, 2024, $12 million and $32 million of accrued severance related costs were included in other accrued liabilities and other liabilities, respectively, and are expected to result in cash expenditures through fiscal 2028. The current and prior year severance related net charges are primarily comprised of accruals for severance and pay for employees being terminated due to the consolidation of certain manufacturing sites, with severance recorded in accordance with ASC 712. The prior year severance related net recoveries are primarily comprised of adjustments to accruals for severance pay for employees being terminated due to the consolidation of certain manufacturing sites, with severance recorded in accordance with ASC 712. By segment, for the three and six months ended December 31, 2024, $3 million and $26 million, respectively, of restructuring costs were incurred in the Materials segment, $3 million and $4 million, respectively, of restructuring costs were incurred in the Networking segment, and $2 million of restructuring costs were incurred in both periods in the Lasers segment. By segment, for the three and six months ended December 31, 2023, $2 million and $7 million, respectively, of restructuring costs were incurred in the Materials segment, partially offset by $3 million and $5 million, respectively, of restructuring recoveries in the Networking segment. Restructuring charges and recoveries are recorded in Restructuring Charges (Recoveries) in our Condensed Consolidated Statements of Earnings (Loss).

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ 103,385	$ (26,991)	$ 129,272	$ (94,525)

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended	6 Months Ended
Insider Trading Arrangements	Dec. 31, 2024 shares	Dec. 31, 2024 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Stephen Skaggs [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On November 21, 2024, Stephen Skaggs, a Company director, adopted a written plan intended to satisfy the affirmative defense of Rule 10b5-1(c) with a duration through December 31, 2025 with respect to the sale of up to 8,000 Company shares.
Name	Stephen Skaggs
Title	director
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	November 21, 2024
Expiration Date	December 31, 2025
Arrangement Duration	405 days
Aggregate Available	8,000	8,000
Julie Eng [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On December 1, 2024, Julie Eng, the Company’s Chief Technology Officer, adopted a written plan intended to satisfy the affirmative defense of Rule 10b5-1(c) with a duration through July 31, 2026 with respect to the sale of up to 9,278 Company shares.
Name	Julie Eng
Title	Chief Technology Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	December 1, 2024
Expiration Date	July 31, 2026
Arrangement Duration	607 days
Aggregate Available	9,278	9,278
Giovanni Barbarossa [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On December 6, 2024, Giovanni Barbarossa, the Company’s Chief Strategy Officer and President, Materials Segment, adopted a written plan intended to satisfy the affirmative defense of Rule 10b5-1(c) with a duration through December 31, 2026 with respect to the sale of up to 120,186 Company shares.
Name	Giovanni Barbarossa
Title	Chief Strategy Officer and President
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	December 6, 2024
Expiration Date	December 31, 2026
Arrangement Duration	755 days
Aggregate Available	120,186	120,186
Christopher Koeppen [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On December 9, 2024, Christopher Koeppen, the Company’s Chief Innovation Officer and SVP, Aerospace & Defense, adopted a written plan intended to satisfy the affirmative defense of Rule 10b5-1(c) with a duration through December 31, 2025 with respect to the sale of up to 31,741 Company shares.
Name	Christopher Koeppen
Title	Chief Innovation Officer and SVP
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	December 9, 2024
Expiration Date	December 31, 2025
Arrangement Duration	387 days
Aggregate Available	31,741	31,741

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
Basis of Presentation (Policies)	Dec. 31, 2024
Accounting Policies [Abstract]
Reclassification	Certain prior year amounts have been reclassified for consistency with the current year presentation.
Recently Issued Financial Accounting Standards	In November 2023, the FASB issued Accounting Standards Update (“ASU”) 2023-07 - Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. This ASU improves reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. This ASU is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The Company is evaluating the impact this will have on the Company’s consolidated financial statements and disclosures. In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures” (“ASU 2023-09”). ASU 2023-09 includes amendments that further enhance income tax disclosures, primarily through standardization and disaggregation of rate reconciliation categories and income taxes paid by jurisdiction. ASU 2023-09 is effective for annual periods beginning after December 15, 2024, on either a prospective or retrospective basis. Early adoption is permitted. The Company is currently evaluating the impact of ASU 2023-09 on its consolidated financial statements and related disclosures. In March 2024, the Securities and Exchange Commission (the “SEC”) issued the final rule under SEC Release No. 33-11275 and 34-99678, “The Enhancement and Standardization of Climate-Related Disclosures for Investors,” requiring public companies to provide certain climate-related information in their registration statements and annual reports. The final rules will require information about a company’s climate-related risks that have materially impacted or are reasonably likely to have a material impact on its business strategy, results of operations, or financial condition, and the actual and potential material impacts of any identified climate-related risks on the company’s strategy, business model and outlook, as well as relating to assessment, management, oversight and mitigation of such material risks, material climate-related targets and goals, and material greenhouse gas emissions. Additionally, certain disclosures related to severe weather events and other natural conditions will be required in the audited financial statements. The first phase of the final rule is effective for fiscal years beginning in 2025. Disclosure for prior periods is only required if it was previously disclosed in an SEC filing. On April 4, 2024, the SEC voluntarily stayed implementation of the final rule to facilitate the orderly judicial resolution of pending legal challenges to the rule. We are currently evaluating the impact on our disclosures of adopting this new pronouncement.
Fair Value of Financial Instruments	The FASB defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous markets for the asset and liability in an orderly transaction between market participants at the measurement date. We estimate fair value of our financial instruments utilizing an established three-level hierarchy in accordance with U.S. GAAP. The hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date as follows: • Level 1 – Valuation is based upon unadjusted quoted prices for identical assets or liabilities in active markets. • Level 2 – Valuation is based upon quoted prices for similar assets and liabilities in active markets, or other inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instruments. • Level 3 – Valuation is based upon other unobservable inputs that are significant to the fair value measurements.

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	6 Months Ended
Revenue from Contracts with Customers (Tables)	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregated Revenue	The following tables summarize disaggregated revenue by market ($000): Three Months Ended December 31, 2024 Six Months Ended December 31, 2024 Networking Materials Lasers Total Networking Materials Lasers Total Industrial $ 13,851 $ 126,381 $ 297,213 $ 437,445 $ 28,231 $ 246,027 $ 570,127 $ 844,385 Communications 792,862 30,237 — 823,099 1,532,018 65,372 — 1,597,390 Electronics 1,793 76,424 18 78,235 3,964 150,481 18 154,463 Instrumentation 7,407 10,433 78,046 95,886 14,572 19,022 152,968 186,562 Total Revenues $ 815,913 $ 243,475 $ 375,277 $ 1,434,665 $ 1,578,785 $ 480,902 $ 723,113 $ 2,782,800 Three Months Ended December 31, 2023 Six Months Ended December 31, 2023 Networking Materials Lasers Total Networking Materials Lasers Total Industrial $ 14,746 $ 137,128 $ 271,494 $ 423,368 $ 30,711 $ 270,331 $ 526,660 $ 827,702 Communications 499,350 20,984 — 520,334 945,624 34,236 — 979,860 Electronics 1,453 87,279 — 88,732 3,177 175,344 — 178,521 Instrumentation 8,686 8,287 82,027 99,000 17,572 18,407 162,455 198,434 Total Revenues $ 524,235 $ 253,678 $ 353,521 $ 1,131,434 $ 997,084 $ 498,318 $ 689,115 $ 2,184,517

Inventories (Tables)

Inventories (Tables)	6 Months Ended
Inventories (Tables)	Dec. 31, 2024
Inventory Disclosure [Abstract]
Schedule of Components of Inventories	The components of inventories were as follows ($000): December 31, June 30, Raw materials $ 386,472 $ 429,888 Work in progress 730,085 620,575 Finished goods 228,006 235,941 Total inventories $ 1,344,563 $ 1,286,404

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	6 Months Ended
Property, Plant and Equipment (Tables)	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	Property, plant and equipment consists of the following ($000): December 31, June 30, Land and improvements $ 65,482 $ 66,156 Buildings and improvements 783,840 774,991 Machinery and equipment 2,127,757 2,034,310 Construction in progress 482,502 398,884 Finance lease right-of-use asset 25,000 25,000 3,484,581 3,299,341 Less accumulated depreciation and amortization (1,595,003) (1,482,082) Property, plant, and equipment, net $ 1,889,578 $ 1,817,259

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
Goodwill and Other Intangible Assets (Tables)	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Carrying Amount of Goodwill	Changes in the carrying amount of goodwill were as follows ($000): Six Months Ended December 31, 2024 Networking Materials Lasers Total Balance-beginning of period $ 1,036,592 $ 245,983 $ 3,181,754 $ 4,464,329 Foreign currency translation (460) 992 (73,806) (73,274) Balance-end of period $ 1,036,132 $ 246,975 $ 3,107,948 $ 4,391,055
Schedule of Gross Carrying Amount and Accumulated Amortization of Intangible Assets Other Than Goodwill	The gross carrying amount and accumulated amortization of our intangible assets other than goodwill were as follows ($000): December 31, 2024 June 30, 2024 Gross Accumulated Net Gross Accumulated Net Book Value Technology $ 1,635,502 $ (452,308) $ 1,183,194 $ 1,653,289 $ (394,040) $ 1,259,249 Trade Names 438,470 (8,470) 430,000 438,470 (8,470) 430,000 Customer Lists 2,270,524 (572,069) 1,698,455 2,310,550 (498,252) 1,812,298 Backlog and Other 87,459 (85,428) 2,031 88,792 (87,092) 1,700 Total $ 4,431,955 $ (1,118,275) $ 3,313,680 $ 4,491,101 $ (987,854) $ 3,503,247

Debt (Tables)

Debt (Tables)	6 Months Ended
Debt (Tables)	Dec. 31, 2024
Debt Disclosure [Abstract]
Schedule of Components of Debt	The components of debt as of the dates indicated were as follows ($000): December 31, June 30, Term A Facility, interest at adjusted SOFR, as defined, plus 1.850% $ 679,375 $ 775,625 Debt issuance costs, Term A Facility and Revolving Credit Facility (10,600) (13,586) Term B Facility, interest at adjusted SOFR, as defined, plus 2.500% 2,232,358 2,384,536 Debt issuance costs, Term B Facility (42,882) (49,835) 1.30% Term loan — 335 Facility construction loan in Germany 17,110 19,082 5.000% Senior Notes 990,000 990,000 Debt issuance costs and discount, Senior Notes (5,459) (5,939) Total debt 3,859,902 4,100,218 Current portion of long-term debt (27,208) (73,770) Long-term debt, less current portion $ 3,832,694 $ 4,026,448

Leases (Tables)

Leases (Tables)	6 Months Ended
Leases (Tables)	Dec. 31, 2024
Leases [Abstract]
Schedule of Lease Costs	The following table presents lease costs, which include leases for arrangements with an initial term of more than 12 months, lease term, and discount rates ($000): Three Months Ended December 31, 2024 Six Months Ended Finance lease cost Amortization of right-of-use assets $ 417 $ 833 Interest on lease liabilities 240 486 Total finance lease cost 657 1,319 Operating lease cost 14,095 28,354 Total lease cost $ 14,752 $ 29,673 Cash Paid for Amounts Included in the Measurement of Lease Liabilities Operating cash flows from finance leases $ 240 $ 246 Operating cash flows from operating leases 13,918 27,572 Financing cash flows from finance leases 425 462 Weighted-Average Remaining Lease Term (in Years) Finance leases 7.0 Operating leases 6.7 Weighted-Average Discount Rate Finance leases 5.6 % Operating leases 7.0 % Three Months Ended Six Months Ended Finance Lease Cost Amortization of right-of-use assets $ 417 $ 833 Interest on lease liabilities 263 531 Total finance lease cost $ 680 $ 1,364 Operating lease cost 12,764 25,707 Total lease cost $ 13,444 $ 27,071 Cash Paid for Amounts Included in the Measurement of Lease Liabilities Operating cash flows from finance leases $ 263 $ 531 Operating cash flows from operating leases 12,264 24,539 Financing cash flows from finance leases 384 763

Equity and Redeemable Preferr_2

Equity and Redeemable Preferred Stock (Tables)	6 Months Ended
Equity and Redeemable Preferred Stock (Tables)	Dec. 31, 2024
Equity [Abstract]
Schedule of Dividends	The following table presents dividends per share and dividends recognized: Three Months Ended Six Months Ended 2024 2023 2024 2023 Dividends per share $ 150 $ 142 $ 298 $ 283 Dividends ($000) 30,727 29,235 61,075 58,109 Deemed dividends ($000) 1,535 1,345 3,020 2,644

Noncontrolling Interests (Table

Noncontrolling Interests (Tables)	6 Months Ended
Noncontrolling Interests (Tables)	Dec. 31, 2024
Noncontrolling Interest [Abstract]
Schedule of Noncontrolling Interests	The following table presents the activity in noncontrolling interests in Silicon Carbide ($000s): Six Months Ended December 31, 2024 2023 Balance-beginning of period $ 371,392 $ — Sale of shares to noncontrolling interests — 373,573 Share of foreign currency translation adjustments (399) 1,065 Net loss (2,869) (1,484) Balance-end of period $ 368,124 $ 373,154

Earnings (Loss) Per Share (Tabl

Earnings (Loss) Per Share (Tables)	6 Months Ended
Earnings (Loss) Per Share (Tables)	Dec. 31, 2024
Earnings Per Share [Abstract]
Schedule of Reconciliation of Basic and Diluted Earnings (Loss) Per Share	The following is a reconciliation of the numerators and denominators of the basic and diluted earnings (loss) per share computations (000, except per share data): Three Months Ended Six Months Ended 2024 2023 2024 2023 Numerator Net earnings (loss) attributable to Coherent Corp. $ 103,385 $ (26,991) $ 129,272 $ (94,525) Deduct Series B dividends and deemed dividends (32,262) (30,580) (64,095) (60,753) Basic earnings (loss) available to common shareholders $ 71,123 $ (57,571) $ 65,177 $ (155,278) Diluted earnings (loss) available to common shareholders $ 71,123 $ (57,571) $ 65,177 $ (155,278) Denominator Weighted average shares 154,767 151,564 154,197 150,946 Effect of dilutive securities: Common stock equivalents 5,222 — 5,078 — Diluted weighted average common shares 159,989 151,564 159,275 150,946 Basic earnings (loss) per common share $ 0.46 $ (0.38) $ 0.42 $ (1.03) Diluted earnings (loss) per common share $ 0.44 $ (0.38) $ 0.41 $ (1.03)
Schedule of Potential Shares Excluded from Calculation of Diluted Net Loss Per Share	The following table presents potential shares of common stock excluded from the calculation of diluted net earnings (loss) per share, as their effect would have been anti-dilutive (000): Three Months Ended Six Months Ended 2024 2023 2024 2023 Common stock equivalents — 1,956 5 2,146 Series B Convertible Preferred Stock 28,920 27,516 28,741 27,346 Total anti-dilutive shares 28,920 29,472 28,746 29,492

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
Segment Reporting (Tables)	Dec. 31, 2024
Segment Reporting [Abstract]
Schedule of Financial Information by Segment	The following table summarizes selected financial information of our operations by segment and reconciles segment profit to consolidated earnings (loss) before income taxes for the periods presented ($000): Three Months Ended Six Months Ended 2024 2023 2024 2023 Segment revenue Networking $ 815,913 $ 524,235 1,578,785 997,084 Materials 243,475 253,678 480,902 498,318 Lasers 375,277 353,521 723,113 689,115 Total segment revenue 1,434,665 1,131,434 2,782,800 2,184,517 Intersegment revenue Networking 12,584 9,979 27,011 22,866 Materials 119,122 96,042 251,290 183,784 Lasers 2,318 1,205 3,882 1,844 Unallocated (134,024) (107,226) (282,183) (208,494) Total intersegment revenue — — — — Segment profit Networking 153,269 95,350 289,175 156,063 Materials 74,117 56,220 165,225 106,322 Lasers 87,520 62,548 151,259 108,241 Total segment profit 314,906 214,118 605,659 370,626 Unallocated Corporate items Corporate and centralized function costs (1) (49,959) (61,669) (123,061) (107,204) Share-based compensation (41,012) (27,252) (76,490) (71,776) Restructuring costs (2) (8,021) 1,570 (32,385) (1,448) Integration, site consolidated and other costs (3) (7,332) (23,376) (18,081) (35,454) Amortization of intangibles (71,716) (71,507) (143,578) (144,168) Interest expense (64,278) (74,678) (130,922) (147,936) Other (income) expense, net 55,816 5,387 66,565 11,656 Earnings (loss) before income taxes $ 128,404 $ (37,407) $ 147,707 $ (125,704) Expenditures for property, plant, and equipment Networking $ 70,211 $ 36,374 $ 118,897 $ 53,867 Materials 30,703 54,511 64,499 95,023 Lasers 4,769 585 14,271 4,777 Total expenditures for property, plant, and equipment $ 105,683 $ 91,470 $ 197,667 $ 153,667 (1) We do not allocate corporate and centralized function costs that are not directly attributable to our operating segments. (2) See Note 17. Restructuring Plan for further information. (3) Integration and site consolidation costs in the three and six months ended December 31, 2024 includes $4 million and $15 million, respectively, in consulting costs related to projects to integrate recent acquisitions into common technology systems and simplify legal entity structure, and $3 million and $2 million, respectively, of employee severance and retention costs related to sites being shut down as part of our 2023 Restructuring Plan or Synergy and Site Consolidation Plan. Integration and site consolidation costs in the three and six months ended December 31, 2023 primarily include $16 million and $23 million, respectively, in consulting costs related to projects to integrate recent acquisitions into common technology systems and simplify legal entity structure, and $4 million and $6 million, respectively, of employee severance and retention costs related to sites being shut down as part of our 2023 Restructuring Plan or Synergy and Site Consolidation Plan.
Schedule of Segment Assets	The following table summarizes segment assets ($000): Segment assets and reconciliation to total assets December 31, June 30, Networking $ 3,545,700 $ 3,472,866 Materials 2,862,533 3,017,858 Lasers 7,062,988 7,361,731 Corporate and shared services 726,113 636,179 Total assets $ 14,197,334 $ 14,488,634

Share-Based Compensation (Table

Share-Based Compensation (Tables)	6 Months Ended
Share-Based Compensation (Tables)	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of Share-Based Compensation Expense	Share-based compensation expense for the periods indicated was as follows ($000): Three Months Ended Six Months Ended 2024 2023 2024 2023 Stock Options and Cash-Based Stock Appreciation Rights $ 166 $ 803 $ 583 $ (254) Restricted Share Awards and Cash-Based Restricted Share Unit Awards 23,881 20,923 47,650 51,988 Performance Share Awards and Cash-Based Performance Share Unit Awards 14,757 2,985 23,749 13,830 Employee Stock Purchase Plan 2,208 2,541 4,508 6,212 $ 41,012 $ 27,252 $ 76,490 $ 71,776

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	6 Months Ended
Fair Value of Financial Instruments (Tables)	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Schedule of Fair Value and Carrying Value of Debt Facilities	The fair value and carrying value of the Debt Facilities were as follows ($000): December 31, 2024 June 30, 2024 Fair Value Carrying Value Fair Value Carrying Value Senior Notes $ 947,093 $ 984,541 $ 938,193 $ 984,061 Term A Facility 682,772 672,923 777,564 762,039 Term B Facility 2,249,101 2,189,476 2,390,497 2,334,701

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
Accumulated Other Comprehensive Income (Loss) (Tables)	Dec. 31, 2024
Equity [Abstract]
Schedule of AOCI, Net of Tax	The changes in AOCI by component, net of tax, for the six months ended December 31, 2024 were as follows ($000): Foreign Interest Rate Instruments Defined Total AOCI - June 30, 2024 $ (26,092) $ 35,916 $ (7,184) $ 2,640 Other comprehensive loss before reclassifications (141,591) (1,695) (584) (143,870) Amounts reclassified from AOCI — (18,486) — (18,486) Net current-period other comprehensive loss (141,591) (20,181) (584) (162,356) AOCI - December 31, 2024 $ (167,683) $ 15,735 $ (7,768) $ (159,716)

Restructuring Plan (Tables)

Restructuring Plan (Tables)	6 Months Ended
Restructuring Plan (Tables)	Dec. 31, 2024
Restructuring and Related Activities [Abstract]
Schedule of Components of Restructuring Charges and Payments and Other Deductions	Activity and accrual balances for the Restructuring Plan were as follows for the first two quarters of fiscal 2024 and 2023 ($000): Severance Asset Write-Offs Other Total Accrual Balance - June 30, 2024 $ 51,061 $ — $ — $ 51,061 Restructuring charges (recoveries) (455) 15,970 8,850 24,365 Payments (6,796) — — (6,796) Asset write-offs and other — (15,970) (8,850) (24,820) Balance - September 30, 2024 43,810 $ — $ — $ 43,810 Restructuring charges 2,882 — 5,139 8,021 Payments (752) — — (752) Asset write-offs and other (1,609) — (5,139) (6,748) Balance - December 31, 2024 $ 44,331 $ — $ — $ 44,331 Severance Asset Write-Offs Other Total Accrual Balance - June 30, 2023 $ 64,379 $ — $ — $ 64,379 Restructuring charges 2,050 269 699 3,018 Payments (7,930) — — (7,930) Asset write-offs and other — (269) (699) (968) Balance - September 30, 2023 58,499 — — 58,499 Restructuring charges (recoveries) (4,848) 54 3,224 (1,570) Payments (2,103) — — (2,103) Asset write-offs and other — (54) (3,224) (3,278) Balance - December 31, 2023 $ 51,548 $ — $ — $ 51,548

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Schedule of Disaggregated Revenue by Market (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 1,434,665	$ 1,131,434	$ 2,782,800	$ 2,184,517
Industrial
Disaggregation of Revenue [Line Items]
Revenues	437,445	423,368	844,385	827,702
Communications
Disaggregation of Revenue [Line Items]
Revenues	823,099	520,334	1,597,390	979,860
Electronics
Disaggregation of Revenue [Line Items]
Revenues	78,235	88,732	154,463	178,521
Instrumentation
Disaggregation of Revenue [Line Items]
Revenues	95,886	99,000	186,562	198,434
Networking
Disaggregation of Revenue [Line Items]
Revenues	815,913	524,235	1,578,785	997,084
Networking \| Industrial
Disaggregation of Revenue [Line Items]
Revenues	13,851	14,746	28,231	30,711
Networking \| Communications
Disaggregation of Revenue [Line Items]
Revenues	792,862	499,350	1,532,018	945,624
Networking \| Electronics
Disaggregation of Revenue [Line Items]
Revenues	1,793	1,453	3,964	3,177
Networking \| Instrumentation
Disaggregation of Revenue [Line Items]
Revenues	7,407	8,686	14,572	17,572
Materials
Disaggregation of Revenue [Line Items]
Revenues	243,475	253,678	480,902	498,318
Materials \| Industrial
Disaggregation of Revenue [Line Items]
Revenues	126,381	137,128	246,027	270,331
Materials \| Communications
Disaggregation of Revenue [Line Items]
Revenues	30,237	20,984	65,372	34,236
Materials \| Electronics
Disaggregation of Revenue [Line Items]
Revenues	76,424	87,279	150,481	175,344
Materials \| Instrumentation
Disaggregation of Revenue [Line Items]
Revenues	10,433	8,287	19,022	18,407
Lasers
Disaggregation of Revenue [Line Items]
Revenues	375,277	353,521	723,113	689,115
Lasers \| Industrial
Disaggregation of Revenue [Line Items]
Revenues	297,213	271,494	570,127	526,660
Lasers \| Communications
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Lasers \| Electronics
Disaggregation of Revenue [Line Items]
Revenues	18	0	18	0
Lasers \| Instrumentation
Disaggregation of Revenue [Line Items]
Revenues	$ 78,046	$ 82,027	$ 152,968	$ 162,455

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Additional Information (Details) $ in Millions	6 Months Ended
	Dec. 31, 2024 USD ($)
Revenue from Contract with Customer [Abstract]
Revenue recognized related to customer payments	$ 41
Contract liabilities	65
Contract liabilities included in other accrued liabilities	52
Contract liabilities included within other liabilities	$ 13

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Jun. 30, 2024
Inventory Disclosure [Abstract]
Raw materials	$ 386,472	$ 429,888
Work in progress	730,085	620,575
Finished goods	228,006	235,941
Total inventories	$ 1,344,563	$ 1,286,404

Property Plant and Equipment (D

Property Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Jun. 30, 2024
Property, Plant and Equipment [Line Items]
Finance lease right-of-use asset	$ 25,000	$ 25,000
Property, plant, and equipment and finance lease right-of-use asset	3,484,581	3,299,341
Less accumulated depreciation and amortization	(1,595,003)	(1,482,082)
Property, plant, and equipment, net	1,889,578	1,817,259
Land and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	65,482	66,156
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	783,840	774,991
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,127,757	2,034,310
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 482,502	$ 398,884

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) $ in Thousands	6 Months Ended
	Dec. 31, 2024 USD ($)
Goodwill [Roll Forward]
Balance-beginning of period	$ 4,464,329
Foreign currency translation	(73,274)
Balance-end of period	4,391,055
Networking
Goodwill [Roll Forward]
Balance-beginning of period	1,036,592
Foreign currency translation	(460)
Balance-end of period	1,036,132
Materials
Goodwill [Roll Forward]
Balance-beginning of period	245,983
Foreign currency translation	992
Balance-end of period	246,975
Lasers
Goodwill [Roll Forward]
Balance-beginning of period	3,181,754
Foreign currency translation	(73,806)
Balance-end of period	$ 3,107,948

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Schedule of Gross Carrying Amount and Accumulated Amortization of Intangible Assets Other Than Goodwill (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Jun. 30, 2024
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,431,955	$ 4,491,101
Accumulated Amortization	(1,118,275)	(987,854)
Net Book Value	3,313,680	3,503,247
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,635,502	1,653,289
Accumulated Amortization	(452,308)	(394,040)
Net Book Value	1,183,194	1,259,249
Trade Names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	438,470	438,470
Accumulated Amortization	(8,470)	(8,470)
Net Book Value	430,000	430,000
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,270,524	2,310,550
Accumulated Amortization	(572,069)	(498,252)
Net Book Value	1,698,455	1,812,298
Backlog and Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	87,459	88,792
Accumulated Amortization	(85,428)	(87,092)
Net Book Value	$ 2,031	$ 1,700

Debt - Schedule of Components o

Debt - Schedule of Components of Debt (Detail) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2024	Jun. 30, 2024	Jul. 01, 2022	Dec. 10, 2021	Dec. 21, 2020
Line of Credit Facility [Line Items]
Total debt	$ 3,859,902	$ 4,100,218
Current portion of long-term debt	(27,208)	(73,770)
Long-term debt, less current portion	3,832,694	4,026,448
Line of credit \| Secured Debt
Line of Credit Facility [Line Items]
Debt, gross	$ 17,000
Line of credit \| Credit Agreement
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.85%
Line of credit \| Credit Agreement \| Term A Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.85%
Debt, gross	$ 679,375	775,625
Line of credit \| Credit Agreement \| Debt issuance costs, Term A Facility and Revolving Credit Facility
Line of Credit Facility [Line Items]
Debt issuance costs	$ (10,600)	(13,586)
Line of credit \| Credit Agreement \| Term B Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.50%
Debt, gross	$ 2,232,358	2,384,536
Debt issuance costs	$ (42,882)	(49,835)
Line of credit \| 1.30% Term loan \| Secured Debt
Line of Credit Facility [Line Items]
Interest rate on debt	1.30%		1.30%
Debt, gross	$ 0	335
Line of credit \| Facility construction loan in Germany \| Secured Debt
Line of Credit Facility [Line Items]
Interest rate on debt					1.55%
Debt, gross	$ 17,110	19,082
Senior Notes \| 5.000% Senior Notes
Line of Credit Facility [Line Items]
Interest rate on debt	5%			5%
Debt, gross	$ 990,000	990,000
Debt issuance costs and discount, Senior Notes	$ (5,459)	$ (5,939)

Debt - Senior Credit Facility (

Debt - Senior Credit Facility (Details) - USD ($)				3 Months Ended			6 Months Ended
Debt - Senior Credit Facility (Details) - USD ($)	Jan. 02, 2025	Apr. 02, 2024	Mar. 31, 2023	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Jul. 01, 2022
Line of Credit Facility [Line Items]
Amortization of debt issuance costs							$ 10,418,000	$ 8,803,000
Revolving Credit Facility \| Credit Agreement \| Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate			1.75%
Line of credit \| Credit Agreement
Line of Credit Facility [Line Items]
Basis spread on variable rate							1.85%
Line of credit \| Credit Agreement \| Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate			2.50%
Line of credit \| Secured Debt \| Credit Agreement
Line of Credit Facility [Line Items]
Aggregate amount of credit facility									$ 4,000,000,000
Interest expense incurred				$ 52,000,000		$ 62,000,000	$ 106,000,000	122,000,000
Increase (decrease) in interest expense				(7,000,000)		(12,000,000)	(21,000,000)	(23,000,000)
Amortization of debt issuance costs				$ 4,000,000		$ 5,000,000	$ 9,000,000	$ 8,000,000
Line of credit \| Term A Facility \| Credit Agreement
Line of Credit Facility [Line Items]
Aggregate amount of credit facility									850,000,000
Adjusted variable rate floor			0.10%
Basis spread on variable rate							1.85%
Line of credit \| Term A Facility \| Credit Agreement \| Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate			1.75%
Line of credit \| Term B Facility \| Credit Agreement
Line of Credit Facility [Line Items]
Aggregate amount of credit facility									2,800,000,000
Adjusted variable rate floor		0.50%
Basis spread on variable rate							2.50%
Debt extinguishment costs					$ 2,000,000
Line of credit \| Term B Facility \| Credit Agreement \| Subsequent Event
Line of Credit Facility [Line Items]
Adjusted variable rate floor	0.50%
Basis spread on variable rate	2%
Line of credit \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate							1.85%
Line of credit \| Revolving Credit Facility \| Credit Agreement
Line of Credit Facility [Line Items]
Aggregate amount of credit facility									350,000,000
Adjusted variable rate floor			0.10%
Line of credit \| Revolving Credit Facility \| Credit Agreement \| Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate			2.50%
Line of credit \| Letter of Credit \| Credit Agreement
Line of Credit Facility [Line Items]
Aggregate amount of credit facility									$ 50,000,000

Debt - Debt Assumed Through Acq

Debt - Debt Assumed Through Acquisition (Details) $ in Thousands	Dec. 21, 2020 EUR (€)	Dec. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Jul. 01, 2022 loan
Line of credit \| Secured Debt
Debt Instrument [Line Items]
Aggregate principal outstanding		$ 17,000
Line of credit \| Secured Debt \| 1.30% Term loan
Debt Instrument [Line Items]
Aggregate principal outstanding		$ 0	$ 335
Interest rate on debt		1.30%		1.30%
Line of credit \| Secured Debt \| 1.00% State of Connecticut term loan due 2023
Debt Instrument [Line Items]
Interest rate on debt				1%
Line of credit \| Secured Debt \| Facility construction loan in Germany
Debt Instrument [Line Items]
Aggregate principal outstanding		$ 17,110	$ 19,082
Interest rate on debt	1.55%
Aggregate amount of credit facility \| €	€ 24,000,000
Term of loan	10 years
Coherent Inc.
Debt Instrument [Line Items]
Number of loans assumed \| loan				3

Debt - Senior Notes (Details)

Debt - Senior Notes (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
Debt - Senior Notes (Details) - USD ($) $ in Millions	Dec. 10, 2021	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Senior Notes \| 5.000% Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	5%	5%		5%
Aggregate principal amount of bridge loan	$ 990
Interest expense incurred		$ 13	$ 13	$ 25	$ 25
Senior Notes \| 5.000% Senior Notes \| Senior Notes, Redemption, Period One
Debt Instrument [Line Items]
Redemption price, percentage of principal amount	100%
Senior Notes \| 5.000% Senior Notes \| Senior Notes, Redemption, Period Two
Debt Instrument [Line Items]
Redemption percentage	40%
Senior Notes \| 5.000% Senior Notes \| Senior Notes, Redemption, Period Three
Debt Instrument [Line Items]
Redemption price, percentage of principal amount	105%
Line of credit \| Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Available credit under lines of credit		$ 319		$ 319

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	6 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2024
Income Tax Disclosure [Abstract]
Effective income tax rate, percent	14%	24%
U.S. statutory rate	21%
Gross unrecognized tax benefit	$ 115		$ 117
Gross unrecognized tax benefits that would impact effective tax rate	19
Interest and penalties accrued	$ 9		$ 7

Leases (Details)

Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Finance lease cost
Amortization of right-of-use assets	$ 417	$ 417	$ 833	$ 833
Interest on lease liabilities	240	263	486	531
Total finance lease cost	657	680	1,319	1,364
Operating lease cost	14,095	12,764	28,354	25,707
Total lease cost	14,752	13,444	29,673	27,071
Cash Paid for Amounts Included in the Measurement of Lease Liabilities
Operating cash flows from finance leases	240	263	246	531
Operating cash flows from operating leases	13,918	12,264	27,572	24,539
Financing cash flows from finance leases	$ 425	$ 384	$ 462	$ 763
Weighted-Average Remaining Lease Term (in Years)
Finance leases	7 years		7 years
Operating leases	6 years 8 months 12 days		6 years 8 months 12 days
Weighted-Average Discount Rate
Finance leases	5.60%		5.60%
Operating leases	7%		7%
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other accrued liabilities		Other accrued liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other liabilities		Other liabilities

Equity and Redeemable Preferr_3

Equity and Redeemable Preferred Stock - Additional Information (Details) $ / shares in Units, $ in Millions			1 Months Ended
	Jul. 03, 2023 shares	Jul. 01, 2022 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) day $ / shares shares	Dec. 31, 2024 shares	Sep. 30, 2024 shares	Jun. 30, 2024 shares	Dec. 31, 2023 shares	Sep. 30, 2023 shares	Jun. 30, 2023 shares	Jul. 31, 2020 shares
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)				5,000,000
Mandatory preferred convertible shares outstanding (in shares)				215,000	215,000	215,000	215,000	215,000	215,000
Redeemable convertible preferred stock, shares issued (in shares)				215,000		215,000
Mandatory Convertible Preferred Stock
Class of Stock [Line Items]
Mandatory preferred convertible shares authorized (in shares)				2,300,000
Mandatory preferred convertible shares outstanding (in shares)				0
Redeemable convertible preferred stock, shares issued (in shares)				0						2,300,000
Convertible preferred stock, shares issued upon conversion (in shares)	4.4523
Series B Convertible Preferred Stock
Class of Stock [Line Items]
Equity per share price (in usd per share) \| $ / shares		$ 10,000
Debt instrument conversion, conversion price per share (in usd per share) \| $ / shares			$ 85
Common stock , conversion, if volume weighted average price, percentage exceeds applicable conversion price			150%
Debt instrument conversion, trading days \| day			20
Debt instrument conversion, consecutive trading days \| day			30
Default on payment obligation, cure period			30 days
Default on payment obligation, dividend rate, quarterly increase, percentage			2%
Preferred stock, accretion of redemption value, period			10 years
Series B Convertible Preferred Stock \| Minimum
Class of Stock [Line Items]
Preferred stock, default on payment obligation, dividend rate, percentage			8%
Series B Convertible Preferred Stock \| Maximum
Class of Stock [Line Items]
Preferred stock, default on payment obligation, dividend rate, percentage			14%
Series B Convertible Preferred Stock \| Private Placement
Class of Stock [Line Items]
Proceeds from common stock and preferred stock options exercised in full \| $		$ 1,400
Series B-1 Convertible Preferred Stock
Class of Stock [Line Items]
Mandatory preferred convertible shares outstanding (in shares)				75,000
Redeemable convertible preferred stock, shares issued (in shares)				75,000
Equity per share price (in usd per share) \| $ / shares			$ 10,000
Series B-1 Convertible Preferred Stock \| Private Placement
Class of Stock [Line Items]
Shares issued and sold (in shares)			75,000
Proceeds from common stock and preferred stock options exercised in full \| $			$ 750
Series B-2 Convertible Preferred Stock
Class of Stock [Line Items]
Mandatory preferred convertible shares outstanding (in shares)				140,000
Redeemable convertible preferred stock, shares issued (in shares)				140,000
Series B-2 Convertible Preferred Stock \| Private Placement
Class of Stock [Line Items]
Shares issued and sold (in shares)		140,000
Common Stock
Class of Stock [Line Items]
Preferred stock, shares converted (in shares)	10,240,290

Equity and Redeemable Preferr_4

Equity and Redeemable Preferred Stock - Schedule of Dividends Recognized (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Class of Stock [Line Items]
Dividends	$ 32,262	$ 30,580	$ 64,095	$ 60,753
Series B Convertible Preferred Stock
Class of Stock [Line Items]
Dividends per share (in usd per share)	$ 150	$ 142	$ 298	$ 283
Dividends	$ 30,727	$ 29,235	$ 61,075	$ 58,109
Deemed dividends	$ 1,535	$ 1,345	$ 3,020	$ 2,644

Noncontrolling Interests - Addi

Noncontrolling Interests - Additional Information (Details) - USD ($) $ in Thousands			6 Months Ended
	Dec. 04, 2023	Oct. 10, 2023	Dec. 31, 2024	Dec. 31, 2023
Noncontrolling Interest [Line Items]
Sale of shares to noncontrolling interests		$ 1,000,000	$ 0	$ 1,000,000
Silicon Carbide
Noncontrolling Interest [Line Items]
Non-controlling ownership interest percentage		75%
Denso Corporation \| Silicon Carbide
Noncontrolling Interest [Line Items]
Equity investment, ownership percentage		12.50%
Mitsubishi Electric Corporation \| Silicon Carbide
Noncontrolling Interest [Line Items]
Equity investment, ownership percentage		12.50%
Denso Corporation \| Silicon Carbide
Noncontrolling Interest [Line Items]
Sale of stock, value of shares issued		$ 500,000
Denso Corporation \| Silicon Carbide \| Common Class A \| Private Placement
Noncontrolling Interest [Line Items]
Shares issued and sold (in shares)	16,666,667
Mitsubishi Electric Corporation \| Silicon Carbide
Noncontrolling Interest [Line Items]
Sale of stock, value of shares issued		$ 500,000
Mitsubishi Electric Corporation \| Silicon Carbide \| Common Class A \| Private Placement
Noncontrolling Interest [Line Items]
Shares issued and sold (in shares)	16,666,667

Noncontrolling Interests - Sche

Noncontrolling Interests - Schedule of Noncontrolling Interests Activity (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2024	Dec. 31, 2023
Equity, Attributable to Noncontrolling Interest [Roll Forward]
Balance-beginning of period	$ 5,871,994	$ 5,581,507	$ 4,831,986	$ 4,987,551	$ 5,581,507	$ 4,987,551
Sale of shares to noncontrolling interests			850,058
Share of foreign currency translation adjustments	(432,264)	290,274	226,788	(107,903)	(141,990)	118,885
Net loss	101,542	24,861	(28,475)	(67,534)	126,403	(96,009)
Balance-end of period	5,536,347	5,871,994	5,844,056	4,831,986	5,536,347	5,844,056
NCI
Equity, Attributable to Noncontrolling Interest [Roll Forward]
Balance-beginning of period	370,917	371,392	0	0	371,392	0
Sale of shares to noncontrolling interests			373,573
Share of foreign currency translation adjustments	(950)	551	1,065
Net loss	(1,843)	(1,026)	(1,484)
Balance-end of period	368,124	370,917	373,154	0	368,124	373,154
NCI \| Silicon Carbide
Equity, Attributable to Noncontrolling Interest [Roll Forward]
Balance-beginning of period		$ 371,392		$ 0	371,392	0
Sale of shares to noncontrolling interests					0	373,573
Share of foreign currency translation adjustments					(399)	1,065
Net loss					(2,869)	(1,484)
Balance-end of period	$ 368,124		$ 373,154		$ 368,124	$ 373,154

Earnings (Loss) Per Share - Sch

Earnings (Loss) Per Share - Schedule of Reconciliation of Basic and Diluted of Earnings (loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Numerator
Net earnings (loss) attributable to Coherent Corp.	$ 103,385	$ (26,991)	$ 129,272	$ (94,525)
Deduct Series B dividends and deemed dividends	(32,262)	(30,580)	(64,095)	(60,753)
Net Earnings (Loss) Available to the Common Shareholders, Basic	71,123	(57,571)	65,177	(155,278)
Net Earnings (Loss) Available to the Common Shareholders, Diluted	$ 71,123	$ (57,571)	$ 65,177	$ (155,278)
Denominator
Weighted average shares, basic (in shares)	154,767	151,564	154,197	150,946
Effect of dilutive securities:
Common stock equivalents (in shares)	5,222	0	5,078	0
Diluted weighted average common shares (in shares)	159,989	151,564	159,275	150,946
Basic earnings (loss) per common share (in usd per share)	$ 0.46	$ (0.38)	$ 0.42	$ (1.03)
Diluted earnings (loss) per common share (in usd per share)	$ 0.44	$ (0.38)	$ 0.41	$ (1.03)

Earnings (Loss) Per Share - S_2

Earnings (Loss) Per Share - Schedule of Potential Shares Excluded from Calculation of Diluted Net Earnings (Loss) Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive shares (in shares)	28,920	29,472	28,746	29,492
Common stock equivalents
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive shares (in shares)	0	1,956	5	2,146
Series B Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive shares (in shares)	28,920	27,516	28,741	27,346

Segment Reporting - Additional

Segment Reporting - Additional Information (Details)	6 Months Ended
Segment Reporting - Additional Information (Details)	Dec. 31, 2024 segment
Segment Reporting [Abstract]
Number of segments	3

Segment Reporting - Schedule of

Segment Reporting - Schedule of Financial Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 1,434,665	$ 1,131,434	$ 2,782,800	$ 2,184,517
Share-based compensation	(41,012)	(27,252)	(76,490)	(71,776)
Restructuring charges (recoveries)			(18,370)	(2,639)
Interest expense	(64,278)	(74,678)	(130,922)	(147,936)
Other income, net	(55,816)	(5,386)	(66,565)	(11,655)
Earnings (loss) before income taxes	128,404	(37,407)	147,707	(125,704)
Expenditures for property, plant, and equipment	105,683	91,470	197,667	153,667
2023 Restructuring Plan
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring charges (recoveries)	(8,000)	2,000	(32,000)	(1,000)
Networking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	815,913	524,235	1,578,785	997,084
Networking \| 2023 Restructuring Plan
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring charges (recoveries)	(3,000)	3,000	(4,000)	5,000
Materials
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	243,475	253,678	480,902	498,318
Materials \| 2023 Restructuring Plan
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring charges (recoveries)	(3,000)	(2,000)	(26,000)	(7,000)
Lasers
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	375,277	353,521	723,113	689,115
Lasers \| 2023 Restructuring Plan
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring charges (recoveries)	(2,000)		(2,000)
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	1,434,665	1,131,434	2,782,800	2,184,517
Segment profit	314,906	214,118	605,659	370,626
Operating Segments \| Networking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	815,913	524,235	1,578,785	997,084
Segment profit	153,269	95,350	289,175	156,063
Expenditures for property, plant, and equipment	70,211	36,374	118,897	53,867
Operating Segments \| Materials
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	243,475	253,678	480,902	498,318
Segment profit	74,117	56,220	165,225	106,322
Expenditures for property, plant, and equipment	30,703	54,511	64,499	95,023
Operating Segments \| Lasers
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	375,277	353,521	723,113	689,115
Segment profit	87,520	62,548	151,259	108,241
Expenditures for property, plant, and equipment	4,769	585	14,271	4,777
Unallocated
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	134,024	107,226	282,183	208,494
Intersegment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	0	0	0	0
Intersegment \| Networking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	(12,584)	(9,979)	(27,011)	(22,866)
Intersegment \| Materials
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	(119,122)	(96,042)	(251,290)	(183,784)
Intersegment \| Lasers
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	(2,318)	(1,205)	(3,882)	(1,844)
Corporate and shared services
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate and centralized function costs	(49,959)	(61,669)	(123,061)	(107,204)
Share-based compensation	(41,012)	(27,252)	(76,490)	(71,776)
Restructuring charges (recoveries)	(8,021)	1,570	(32,385)	(1,448)
Integration, site consolidated and other costs	(7,332)	(23,376)	(18,081)	(35,454)
Amortization of intangibles	(71,716)	(71,507)	(143,578)	(144,168)
Interest expense	(64,278)	(74,678)	(130,922)	(147,936)
Other income, net	55,816	5,387	66,565	11,656
Earnings (loss) before income taxes	128,404	(37,407)	147,707	(125,704)
Consulting costs related to projects to integrate recent acquisitions	4,000	16,000	15,000	23,000
Corporate and shared services \| 2023 Restructuring Plan
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Manufacturing inefficiencies, employee severance and retention costs and duplicative labor	$ 3,000	$ 4,000	$ 2,000	$ 6,000

Segment Reporting - Schedule _2

Segment Reporting - Schedule of Segment Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Jun. 30, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total assets	$ 14,197,334	$ 14,488,634
Operating Segments \| Networking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total assets	3,545,700	3,472,866
Operating Segments \| Materials
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total assets	2,862,533	3,017,858
Operating Segments \| Lasers
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total assets	7,062,988	7,361,731
Corporate and shared services
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total assets	$ 726,113	$ 636,179

Share-Based Compensation - Addi

Share-Based Compensation - Additional Information (Details) - shares	Oct. 11, 2024	Jun. 03, 2024	Aug. 28, 2023
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)		147,214
Award vesting period		3 years
RSUs \| Share-Based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	15,902
Award vesting period	3 years
RSUs \| Share-Based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	63,154
Award vesting period	2 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted (in shares)	118,853	694,007
Award vesting period	3 years	3 years
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Offering period			6 months
Employee Stock Purchase Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of employee payroll deductions authorized			15%
Employee Stock Purchase Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of fair market value of common stock to purchase shares			85%

Share-Based Compensation - Sche

Share-Based Compensation - Schedule of Expense by Award Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	$ 41,012	$ 27,252	$ 76,490	$ 71,776
Stock Options and Cash-Based Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	166	803	583	(254)
Restricted Share Awards and Cash-Based Restricted Share Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	23,881	20,923	47,650	51,988
Performance Share Awards and Cash-Based Performance Share Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	14,757	2,985	23,749	13,830
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	$ 2,208	$ 2,541	$ 4,508	$ 6,212

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Additional Information (Details) - USD ($)

3 Months Ended

6 Months Ended

Dec. 31, 2024

Dec. 31, 2023

Dec. 31, 2024

Dec. 31, 2023

Sep. 24, 2024

Sep. 01, 2024

Aug. 31, 2024

Jun. 30, 2024

Mar. 20, 2023

Feb. 28, 2023

Jun. 30, 2022

Feb. 23, 2022

Nov. 24, 2019

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Derivative asset, statement of financial position

Prepaid and other current assets

Restricted cash

$ 751,000,000

$ 864,000,000

Realized gains on derivatives

$ 14,000,000

16,000,000

$ 3,000,000

Silicon Carbide

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Restricted cash

748,000,000

858,000,000

Other Entities

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Restricted cash

3,000,000

5,000,000

Interest Rate Swap

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Notional amount

$ 825,000,000

$ 1,075,000,000

Fixed interest rate

0.10%

1.52%

Floor interest rate

1.42%

Derivative asset

8,000,000

Interest Rate Cap

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Notional amount

$ 1,500,000,000

$ 500,000,000

Fixed interest rate

0.853%

Derivative asset

$ 32,000,000

$ 50,000,000

SOFR percentage of derivative

1.92%

Interest Rate Cap | Minimum

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Notional amount

$ 500,000,000

Interest Rate Cap | Maximum

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Notional amount

$ 1,500,000,000

Fair Value of Financial Instr_4

Fair Value of Financial Instruments - Schedule of Fair Value and Carrying Value of Debt Facilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Jun. 30, 2024
Fair Value \| Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt facilities	$ 947,093	$ 938,193
Fair Value \| Term A Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt facilities	682,772	777,564
Fair Value \| Term B Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt facilities	2,249,101	2,390,497
Carrying Value \| Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt facilities	984,541	984,061
Carrying Value \| Term A Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt facilities	672,923	762,039
Carrying Value \| Term B Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt facilities	$ 2,189,476	$ 2,334,701

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	6 Months Ended
	Dec. 31, 2024 USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance-beginning of period	$ 5,581,507
Balance-end of period	5,536,347
Total Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance-beginning of period	2,640
Other comprehensive loss before reclassifications	(143,870)
Amounts reclassified from AOCI	(18,486)
Net current-period other comprehensive loss	(162,356)
Balance-end of period	(159,716)
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance-beginning of period	(26,092)
Other comprehensive loss before reclassifications	(141,591)
Amounts reclassified from AOCI	0
Net current-period other comprehensive loss	(141,591)
Balance-end of period	(167,683)
Interest Rate Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance-beginning of period	35,916
Other comprehensive loss before reclassifications	(1,695)
Amounts reclassified from AOCI	(18,486)
Net current-period other comprehensive loss	(20,181)
Balance-end of period	15,735
Defined Benefit Pension Plan
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance-beginning of period	(7,184)
Other comprehensive loss before reclassifications	(584)
Amounts reclassified from AOCI	0
Net current-period other comprehensive loss	(584)
Balance-end of period	$ (7,768)

Restructuring Plan - Additional

Restructuring Plan - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring charges (recoveries)			$ 18,370	$ 2,639
May 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges (recoveries)	$ 8,000	$ (2,000)	32,000	1,000
May 2023 Restructuring Plan \| Materials
Restructuring Cost and Reserve [Line Items]
Restructuring charges (recoveries)	3,000	2,000	26,000	7,000
May 2023 Restructuring Plan \| Networking
Restructuring Cost and Reserve [Line Items]
Restructuring charges (recoveries)	3,000	$ (3,000)	4,000	$ (5,000)
May 2023 Restructuring Plan \| Lasers
Restructuring Cost and Reserve [Line Items]
Restructuring charges (recoveries)	2,000		2,000
May 2023 Restructuring Plan \| Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring accrual, current	12,000		12,000
Restructuring accrual, noncurrent	$ 32,000		$ 32,000

Restructuring Plan - Schedule o

Restructuring Plan - Schedule of Components and Restructuring Charges and Payments (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2024	Dec. 31, 2023
Restructuring Reserve [Roll Forward]
Restructuring charges (recoveries)	$ 8,021		$ (1,570)		$ 32,385	$ 1,448
May 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning Balance	43,810	$ 51,061	58,499	$ 64,379	51,061	64,379
Restructuring charges (recoveries)	8,021	24,365	(1,570)	3,018
Payments	(752)	(6,796)	(2,103)	(7,930)
Asset write-offs and other	(6,748)	(24,820)	(3,278)	(968)
Ending Balance	44,331	43,810	51,548	58,499	44,331	51,548
May 2023 Restructuring Plan \| Severance
Restructuring Reserve [Roll Forward]
Beginning Balance	43,810	51,061	58,499	64,379	51,061	64,379
Restructuring charges (recoveries)	2,882	(455)	(4,848)	2,050
Payments	(752)	(6,796)	(2,103)	(7,930)
Asset write-offs and other	(1,609)	0	0	0
Ending Balance	44,331	43,810	51,548	58,499	44,331	51,548
May 2023 Restructuring Plan \| Asset Write-Offs
Restructuring Reserve [Roll Forward]
Beginning Balance	0	0	0	0	0	0
Restructuring charges (recoveries)	0	15,970	54	269
Payments	0	0	0	0
Asset write-offs and other	0	(15,970)	(54)	(269)
Ending Balance	0	0	0	0	0	0
May 2023 Restructuring Plan \| Other
Restructuring Reserve [Roll Forward]
Beginning Balance	0	0	0	0	0	0
Restructuring charges (recoveries)	5,139	8,850	3,224	699
Payments	0	0	0	0
Asset write-offs and other	(5,139)	(8,850)	(3,224)	(699)
Ending Balance	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0