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VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Sep. 30, 2025
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
VALUATION AND QUALIFYING ACCOUNTS | TRANSDIGM GROUP INCORPORATED VALUATION AND QUALIFYING ACCOUNTS FOR THE FISCAL YEARS ENDED SEPTEMBER 30, 2025, 2024, AND 2023 (Amounts in millions)
Column A |  | Column B |  | Column C |  | Column D |  | Column E
|  | Balance at Beginning of Period |  | Additions |  | Divestitures & Deductions from Reserve (1) |  | Balance at End of Period
Description |  | Charged to Costs and Expenses |  | Acquisitions & Purchase Price Adjustments |
Year Ended September 30, 2025 |  |  |  |  |  |  |  |  |  |
Allowance for uncollectible accounts |  | $ | 32 |  |  | $ | 4 |  |  | $ | — |  |  | $ | (11) |  |  | $ | 25 |
Inventory valuation reserves |  | 236 |  |  | 51 |  |  | 2 |  |  | (19) |  |  | 270 |
Valuation allowance for deferred tax assets |  | 318 |  |  | 138 |  |  | — |  |  | — |  |  | 456 |
Year Ended September 30, 2024 |  |  |  |  |  |  |  |  |  |
Allowance for uncollectible accounts |  | $ | 31 |  |  | $ | 3 |  |  | $ | — |  |  | $ | (2) |  |  | $ | 32 |
Inventory valuation reserves |  | 209 |  |  | 35 |  |  | 11 |  |  | (19) |  |  | 236 |
Valuation allowance for deferred tax assets |  | 227 |  |  | 91 |  |  | — |  |  | — |  |  | 318 |
Year Ended September 30, 2023 |  |  |  |  |  |  |  |  |  |
Allowance for uncollectible accounts |  | $ | 35 |  |  | $ | 4 |  |  | $ | — |  |  | $ | (8) |  |  | $ | 31 |
Inventory valuation reserves |  | 196 |  |  | 20 |  |  | — |  |  | (7) |  |  | 209 |
Valuation allowance for deferred tax assets |  | 137 |  |  | 90 |  |  | — |  |  | — |  |  | 227 |
(1)The amounts in this column represent the impact from divestitures, charge-offs net of recoveries and the impact of foreign currency translation adjustments.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 + Details
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