XML 91 R75.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Revenue from Contracts with Customers - Contract Assets and Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 29, 2024 | Dec. 31, 2023 | Jan. 01, 2023
Contract Assets, Current [Roll Forward] |  |  |
Balance as of beginning of fiscal year | $ 59.1 | $ 64.1 | $ 53.9
Recognized in current year | 88.9 | 84.1 | 105.0
Reclassified to accounts receivable | (72.4) | (89.5) | (88.0)
Reclassification to/from contract liability | 0.0 | 0.4 | (6.8)
Balance as of period end | 75.6 | 59.1 | 64.1
Contract Liabilities, Current [Roll Forward] |  |  |
Balance as of beginning of fiscal year | 163.6 | 149.1 | 116.2
Recognized in current year | 133.6 | 133.4 | 183.1
Amounts in beginning balance reclassified to revenue | (88.2) | (107.9) | (99.8)
Current year amounts reclassified to revenue | (56.3) | (40.9) | (72.3)
Other | 0.0 | (0.7) | 0.7
Reclassification to/from long-term and contract asset | 16.7 | 30.6 | 21.2
Balance as of period end | 169.4 | 163.6 | 149.1
Contract Liabilities, Noncurrent [Roll Forward] |  |  |
Balance as of beginning of fiscal year | 39.4 | 66.8 | 84.4
Recognized in current year | 22.6 | 2.8 | 10.4
Reclassification to/from short-term | (16.7) | (30.2) | (28.0)
Balance as of period end | $ 45.3 | $ 39.4 | $ 66.8

X
- Definition Change in Contract with Customer, Current, Asset [Roll Forward] + References No definition available. + Details
Name: | ati_ChangeinContractwithCustomerCurrentAssetRollForward
Namespace Prefix: | ati_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Change in Contract with Customer, Liability, Current [Roll Forward] + References No definition available. + Details
Name: | ati_ChangeinContractwithCustomerLiabilityCurrentRollForward
Namespace Prefix: | ati_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Change in Contract with Customer, Liability, Noncurrent [Roll Forward] + References No definition available. + Details
Name: | ati_ChangeinContractwithCustomerLiabilityNoncurrentRollForward
Namespace Prefix: | ati_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Contract with Customer, Asset, Current, Period Increase + References No definition available. + Details
Name: | ati_ContractwithCustomerAssetCurrentPeriodIncrease
Namespace Prefix: | ati_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Contract with Customer, Asset, Current, Reclassification + References No definition available. + Details
Name: | ati_ContractwithCustomerAssetCurrentReclassification
Namespace Prefix: | ati_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Contract with Customer, Asset, Current, Reclassified to Receivable + References No definition available. + Details
Name: | ati_ContractwithCustomerAssetCurrentReclassifiedtoReceivable
Namespace Prefix: | ati_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Contract with Customer, Liability, Current, Other + References No definition available. + Details
Name: | ati_ContractwithCustomerLiabilityCurrentOther
Namespace Prefix: | ati_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Contract with Customer, Liability, Current, Period Increase + References No definition available. + Details
Name: | ati_ContractwithCustomerLiabilityCurrentPeriodIncrease
Namespace Prefix: | ati_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Contract with Customer, Liability, Current, Reclassification + References No definition available. + Details
Name: | ati_ContractwithCustomerLiabilityCurrentReclassification
Namespace Prefix: | ati_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Contract with Customer, Liability, Current, Reclassified to Revenue + References No definition available. + Details
Name: | ati_ContractwithCustomerLiabilityCurrentReclassifiedtoRevenue
Namespace Prefix: | ati_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Contract with Customer, Liability, Current, Revenue Recognized + References No definition available. + Details
Name: | ati_ContractwithCustomerLiabilityCurrentRevenueRecognized
Namespace Prefix: | ati_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Contract with Customer, Liability, Noncurrent, Period Increase + References No definition available. + Details
Name: | ati_ContractwithCustomerLiabilityNoncurrentPeriodIncrease
Namespace Prefix: | ati_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Contract with Customer, Liability, Noncurrent, Reclassification + References No definition available. + Details
Name: | ati_ContractwithCustomerLiabilityNoncurrentReclassification
Namespace Prefix: | ati_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
Name: | us-gaap_ContractWithCustomerAssetNetCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-2 + Details
Name: | us-gaap_ContractWithCustomerLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-2 + Details
Name: | us-gaap_ContractWithCustomerLiabilityNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant