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Segment and Geographic Reporting - Schedule of Capital Expenditures, Depreciation and Amortization by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |
Expenditures for property, plant & equipment | $ 440,836 | $ 346,816 | $ 436,060
Depreciation and amortization | 553,598 | 559,761,000 | 681,687,000
Operating Segments | Networking |  |  |
Segment Reporting Information [Line Items] |  |  |
Expenditures for property, plant & equipment | 263,425 | 90,950 | 98,192
Depreciation and amortization | 162,225 | 158,833,000 | 169,573,000
Operating Segments | Materials |  |  |
Segment Reporting Information [Line Items] |  |  |
Expenditures for property, plant & equipment | 137,444 | 224,482 | 274,434
Depreciation and amortization | 119,118 | 107,798,000 | 141,648,000
Operating Segments | Lasers |  |  |
Segment Reporting Information [Line Items] |  |  |
Expenditures for property, plant & equipment | 39,967 | 31,384 | 63,434
Depreciation and amortization | 267,328 | 287,662,000 | 364,370,000
Corporate and shared services |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | $ 4,927 | $ 5,468,000 | $ 6,096,000

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
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- Definition Amount of expenditure for addition to long-lived assets included in determination of segment assets by chief operating decision maker (CODM) or otherwise regularly provided to CODM. Excludes expenditure for addition to financial instrument, long-term customer relationship of financial institution, mortgage and other servicing rights, deferred policy acquisition cost, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 48 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-48 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 49 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-49 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 25 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 + Details
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