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VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
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 AColumn BColumn CColumn DColumn E
  Balance at
Beginning of
Period		Additions
Divestitures & Deductions from
Reserve (1)
Balance at
End of
Period
DescriptionCharged to Costs
and Expenses		Acquisitions & Purchase Price Adjustments
Year Ended September 30, 2025
Allowance for uncollectible accounts$32 $4 $— $(11)$25 
Inventory valuation reserves236 51 2 (19)270 
Valuation allowance for deferred tax assets318 138 — — 456 
Year Ended September 30, 2024
Allowance for uncollectible accounts$31 $3 $— $(2)$32 
Inventory valuation reserves209 35 11 (19)236 
Valuation allowance for deferred tax assets227 91 — — 318 
Year Ended September 30, 2023
Allowance for uncollectible accounts$35 $4 $— $(8)$31 
Inventory valuation reserves196 20 — (7)209 
Valuation allowance for deferred tax assets137 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.