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Debt - Narrative (Details) $ / shares in Units, shares in Millions |  | 3 Months Ended | 8 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 11, 2023 USD ($) | Sep. 29, 2024 USD ($) $ / shares shares | Sep. 10, 2024 USD ($) | Oct. 01, 2023 USD ($) | Sep. 10, 2024 | Dec. 29, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jan. 01, 2023 USD ($) shares | Jan. 02, 2022 $ / shares | Sep. 09, 2027 USD ($) | Mar. 31, 2024 USD ($) | Sep. 09, 2022 USD ($) | Sep. 08, 2022 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of debt issuance costs |  |  |  |  |  | $ 0 | $ 6,200,000 | $ 0 |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  | 14,200,000 | 19,600,000 |  |  |  |  |  |
Total interest expense |  |  |  |  |  | 108,200,000 | 92,800,000 | 87,400,000 |  |  |  |  |
Conversion of convertible notes |  | $ 291,000,000.0 |  |  |  | 291,700,000 |  | $ 82,500,000 |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities | shares |  | 18.8 |  |  |  |  |  | 5.7 |  |  |  |  |
Repayment of Long-term Debt, Long-term Lease Obligation, and Capital Security |  |  |  |  |  | 29,600,000 | 25,200,000 | $ 23,100,000 |  |  |  |  |
Interest expense |  |  |  |  |  | 124,200,000 | 105,800,000 | 92,100,000 |  |  |  |  |
Interest costs capitalized |  |  |  |  |  | 11,800,000 | 13,500,000 | 5,100,000 |  |  |  |  |
Interest costs paid |  |  |  |  |  | 131,400,000 | 114,700,000 | 92,800,000 |  |  |  |  |
Interest income |  |  |  |  |  | 16,000,000.0 | 13,000,000.0 | 4,700,000 |  |  |  |  |
2025 |  |  |  |  |  | 180,500,000 |  |  |  |  |  |  |
2026 |  |  |  |  |  | 25,000,000.0 |  |  |  |  |  |  |
2027 |  |  |  |  |  | 572,200,000 |  |  |  |  |  |  |
2028 |  |  |  |  |  | 16,700,000 |  |  |  |  |  |  |
2029 |  |  |  |  |  | 335,800,000 |  |  |  |  |  |  |
Receipt of convertible note capped call |  | $ 76,100,000 |  |  |  | 76,100,000 | 0 | $ 0 |  |  |  |  |
Pension Benefits [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Employer contributions |  |  |  | $ 222,000,000 |  | 3,300,000 | 278,000,000.0 |  |  |  |  |  |
Pension plan contributions |  |  |  | $ 222,000,000 |  | 3,300,000 | 278,000,000.0 |  |  |  |  |  |
Fair Value Measurements at Reporting Date Using Total Estimated Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  | 1,889,700,000 | 2,746,700,000 |  |  |  |  |  |
Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  | 1,580,200,000 | 2,438,900,000 |  |  |  |  |  |
Foreign credit agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument carrying amount |  |  |  |  |  | 0 | 5,000,000.0 |  |  |  |  |  |
ATI Inc., Convertible Senior Notes, 3.5%, Due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of Long-term Debt, Long-term Lease Obligation, and Capital Security |  | 400,000 |  |  |  |  |  |  |  |  |  |  |
ATI Inc., Convertible Senior Notes, 3.5%, Due 2025 | Convertible Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of Deferred Debt Issuance Cost |  | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price with Premium | $ / shares |  | $ 15.45 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Increase, Accrued Interest |  |  | $ 2,300,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio, Premium |  |  |  |  | 0.647178 |  |  |  |  |  |  |  |
ATI Convertible Senior Notes, 4.75%, Due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  | 4.75% |  |  |  |
ATI Convertible Senior Notes, 4.75%, Due 2022 [Member] | Convertible Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of convertible notes | $ / shares |  |  |  |  |  |  |  |  | $ 14.45 |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  | 5.40% |  |  |  |  |
Interest Expense, Debt, Excluding Amortization |  |  |  |  |  |  |  | $ 2,000,000.0 |  |  |  |  |
Amortization of Debt Issuance Costs |  |  |  |  |  |  |  | 300,000 |  |  |  |  |
Total interest expense |  |  |  |  |  |  |  | $ 2,300,000 |  |  |  |  |
Convertible debt conversion rate in shares of stock |  |  |  |  |  |  |  |  | 0.0692042 |  |  |  |
ATI $350 million 5.875% Senior Notes due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument carrying amount |  |  |  |  |  | $ 350,000,000.0 | $ 350,000,000.0 |  |  |  |  |  |
Debt Instrument, Issuer |  |  |  |  |  | ATI Inc. | ATI Inc. |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  | Dec. 01, 2027 | Dec. 01, 2027 |  |  |  |  |  |
ATI $350 million 5.875% Senior Notes due 2027 | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  | 5.875% | 5.875% |  |  |  |  |  |
ATI Convertible Senior Notes, 3.5%, Due 2025 [Member] | Convertible Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  | 3.50% |  |  |  |  |  |
Debt instrument carrying amount |  |  |  |  |  | $ 0 | $ 291,400,000 |  |  |  |  |  |
Conversion price of convertible notes | $ / shares |  | 15.49 |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  | $ 2,900,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  | 4.20% | 4.20% | 4.20% |  |  |  |  |
Debt Instrument, Convertible, Cap Price | $ / shares |  | $ 19.76 |  |  |  |  |  |  |  |  |  |  |
Interest Expense, Debt, Excluding Amortization |  |  |  |  |  | $ 7,200,000 | $ 10,200,000 | $ 10,200,000 |  |  |  |  |
Amortization of Debt Issuance Costs |  |  |  |  |  | 1,300,000 | 1,900,000 | 1,800,000 |  |  |  |  |
Total interest expense |  |  |  |  |  | 8,500,000 | $ 12,100,000 | 12,000,000.0 |  |  |  |  |
Convertible debt conversion rate in shares of stock |  |  |  |  |  |  | 0.0645745 |  |  |  |  |  |
Debt Instrument, Issuer |  |  |  |  |  |  | ATI Inc. |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  | Jun. 15, 2025 |  |  |  |  |  |
ATI Convertible Senior Notes, 3.5%, Due 2025 [Member] | Convertible Debt [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measurements at Reporting Date Using Total Estimated Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  | $ 864,000,000 |  |  |  |  |  |
ATI 2029 Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument carrying amount |  |  |  |  |  | $ 325,000,000.0 | $ 325,000,000.0 |  |  |  |  |  |
Debt Instrument, Issuer |  |  |  |  |  | ATI Inc. | ATI Inc. |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  | Oct. 01, 2029 | Oct. 01, 2029 |  |  |  |  |  |
ATI 2029 Notes | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  | 4.875% | 4.875% |  |  |  |  |  |
ATI 2031Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument carrying amount |  |  |  |  |  | $ 350,000,000.0 | $ 350,000,000.0 |  |  |  |  |  |
Debt Instrument, Issuer |  |  |  |  |  | ATI Inc. | ATI Inc. |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  | Oct. 01, 2031 | Oct. 01, 2031 |  |  |  |  |  |
ATI 2031Notes | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  | 5.125% | 5.125% |  |  |  |  |  |
ATI Inc., Convertible Senior Notes, 4.75%, Due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of Long-term Debt, Long-term Lease Obligation, and Capital Security |  |  |  |  |  |  |  | $ 1,700,000 |  |  |  |  |
Domestic Bank Group $600 million asset-based credit facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility amount outstanding |  |  |  |  |  | $ 30,500,000 |  |  |  |  |  |  |
Average outstanding amount |  |  |  |  |  | 0 | $ 13,000,000 |  |  |  |  |  |
Bridge Loan |  |  |  |  |  | 60,000,000 |  |  |  |  |  |  |
Short-Term Debt |  |  |  |  |  | 0 | $ 0 |  |  |  |  |  |
Interest rate during period |  |  |  |  |  |  | 6.50% |  |  |  |  |  |
2027 Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  | 4.21% |  |
Debt instrument carrying amount |  |  |  |  |  | 200,000,000 | $ 200,000,000.0 |  |  |  |  |  |
Debt Instrument, Prepayment Increments, Minimum |  |  |  |  |  | $ 25,000,000 |  |  |  |  |  |  |
Debt Instrument, Issuer |  |  |  |  |  | ATI Inc. | ATI Inc. |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  | Sep. 30, 2027 | Sep. 30, 2027 |  |  |  |  |  |
2027 Term Loan | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate spread |  |  |  |  |  | 2.00% |  |  |  |  |  |  |
ATI 2030 Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  | 7.25% | 7.25% |  |  |  |  |  |
Debt instrument carrying amount |  |  |  |  |  | $ 425,000,000.0 | $ 425,000,000.0 |  |  |  |  |  |
Debt Issuance Costs, Net | $ 6,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  | 7 years |  |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  | 101.00% |  |  |  |  |  |  |
Proceeds from Debt, Net of Issuance Costs | $ 418,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Issuer |  |  |  |  |  | ATI Inc. | ATI Inc. |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  | Aug. 15, 2030 | Aug. 15, 2030 |  |  |  |  |  |
ATI 2030 Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, notice period required for redemption |  |  |  |  |  | 15 days |  |  |  |  |  |  |
ATI 2030 Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, notice period required for redemption |  |  |  |  |  | 60 days |  |  |  |  |  |  |
Allegheny Ludlum 6.95% Debentures due 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  | 6.95% | 6.95% |  |  |  |  |  |
Debt instrument carrying amount |  |  |  |  |  | $ 150,000,000.0 | $ 150,000,000.0 |  |  |  |  |  |
Debt Instrument, Issuer |  |  |  |  |  | Allegheny Ludlum | Allegheny Ludlum |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  | Dec. 15, 2025 | Dec. 15, 2025 |  |  |  |  |  |
Allegheny Ludlum 6.95% Debentures due 2025 [Member] | Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  | 6.95% | 6.95% |  |  |  |  |  |
Revolving Credit Facility [Member] | Domestic Bank Group $600 million asset-based credit facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit maximum borrowing capacity |  |  |  |  |  | $ 600,000,000 |  |  |  |  |  |  |
Fixed charge coverage ratio |  |  |  |  |  | 1.00 |  |  |  |  |  |  |
Remaining borrowing capacity, percent of minimum borrowing capacity |  |  |  |  |  | 10.00% |  |  |  |  |  |  |
Minimum remaining borrowing capacity |  |  |  |  |  | $ 60,000,000.0 |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  |  |  |  |  |  | $ 2,400,000 | $ 1,700,000
Debt Covenant, Undrawn Availability Requirement, Amount |  |  |  |  |  | $ 120,000,000 |  |  |  |  |  |  |
Debt Covenant, Undrawn Availability Requirement, Percent Of Total Available Liquidity |  |  |  |  |  | 20.00% |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Domestic Bank Group $600 million asset-based credit facility | Minimum | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate spread |  |  |  |  |  | 0.25% |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Domestic Bank Group $600 million asset-based credit facility | Minimum | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate spread |  |  |  |  |  | 1.25% |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Domestic Bank Group $600 million asset-based credit facility | Maximum | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate spread |  |  |  |  |  | 0.75% |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Domestic Bank Group $600 million asset-based credit facility | Maximum | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate spread |  |  |  |  |  | 1.75% |  |  |  |  |  |  |
Letter of Credit [Member] | Domestic Bank Group $600 million asset-based credit facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit maximum borrowing capacity |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |
Foreign Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit maximum borrowing capacity |  |  |  |  |  | $ 70,000,000 |  |  |  |  |  |  |
Interest Rate Swap [Member] | 2027 Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |
Forecast | Revolving Credit Facility [Member] | Domestic Bank Group $600 million asset-based credit facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Increase to Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |  |

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