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Restructuring Charges - Restructuring Activities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Liability, Beginning Balance | [1] | $ 77,984 |  | $ 27,196 | $ 0
Restructuring Charges | [1] | 80,539 | [2] | 131,088 | 70,901
Payments | [1] | (81,407) |  | (64,781) | (29,861)
Non-Cash items | [1] | (4,158) |  | (15,519) | (13,844)
Restructuring Liability, Ending Balance | [1] | 72,958 |  | 77,984 | 27,196
Workforce |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Liability, Beginning Balance | [1] | 75,319 |  | 24,831 | 0
Restructuring Charges | [1] | 73,794 |  | 115,843 | 53,547
Payments | [1] | (77,774) |  | (63,389) | (25,870)
Non-Cash items | [1] | (1,065) |  | (1,966) | (2,846)
Restructuring Liability, Ending Balance | [1] | 70,274 |  | 75,319 | 24,831
Premises and other |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring Liability, Beginning Balance | [1] | 2,665 |  | 2,365 | 0
Restructuring Charges | [1] | 6,745 |  | 15,245 | 17,354
Payments | [1] | (3,633) |  | (1,392) | (3,991)
Non-Cash items | [1] | (3,093) |  | (13,553) | (10,998)
Restructuring Liability, Ending Balance | [1] | $ 2,684 |  | $ 2,665 | $ 2,365
[1] | The tables above do not include amounts related to employees' benefit incurred in prior periods.
[2] | or further details see Note 22 "Segment Information and Revenue from Significant Customers".

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