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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands | Open Market Repurchases [Member] Common Stock Outstanding [Member] | Open Market Repurchases [Member] Additional Paid-in Capital [Member] | Open Market Repurchases [Member] AOCI Attributable to Parent [Member] | Open Market Repurchases [Member] Retained Earnings [Member] | Open Market Repurchases [Member] Treasury Stock, Common [Member] | Open Market Repurchases [Member] | Common Stock Outstanding [Member] | Additional Paid-in Capital [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Treasury Stock, Common [Member] | Total
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Balance (in shares) at Sep. 30, 2022 |  |  |  |  |  |  | 88,482,125 |  |  |  |  |
Balance at Sep. 30, 2022 |  |  |  |  |  |  | $ 885 | $ 1,992,017 | $ (83,916) | $ 1,655,356 | $ (200,956) | $ 3,363,386
Shares issued under restricted stock and purchase plans, net of shares withheld for employee taxes (in shares) |  |  |  |  |  |  | 267,133 |  |  |  |  |
Shares issued under restricted stock and purchase plans, net of shares withheld for employee taxes |  |  |  |  |  |  | $ 3 | (1,371) | 0 | 0 | 0 | (1,368)
Accelerated share repurchase (in shares) | (7,382,956) |  |  |  |  |  | (10,072,055) |  |  |  |  |
Share repurchases | $ 0 | $ 0 | $ 0 | $ 0 | $ (342,400) | $ (342,400) | $ 0 | 0 | 0 | 0 | (501,637) | (501,637)
Retirement of treasury shares |  |  |  |  |  |  | (175) | (843,862) | 0 | 0 | 844,037 | 0
Stock-based compensation |  |  |  |  |  |  | 0 | 9,376 | 0 | 0 | 0 | 9,376
Net investment hedge currency translation adjustment, net of tax |  |  |  |  |  |  | 0 | 0 | (61,533) | 0 | 0 | (61,533)
Foreign currency translation adjustments |  |  |  |  |  |  | 0 | 0 | 77,246 | 0 | 0 | 77,246
Changes in unrealized losses on marketable securities, net of tax |  |  |  |  |  |  | 0 | 0 | 5,774 | 0 | 0 | 5,774
Net loss |  |  |  |  |  |  | 0 | 0 | 0 | (14,636) | 0 | (14,636)
Actuarial gain on pension plans, net of tax |  |  |  |  |  |  | 0 | 0 | 3 | 0 | 0 | 3
Other |  |  |  |  |  |  | $ 0 | 0 | 0 | (104) | 0 | (104)
Balance (in shares) at Sep. 30, 2023 |  |  |  |  |  |  | 71,294,247 |  |  |  |  |
Balance at Sep. 30, 2023 |  |  |  |  |  |  | $ 713 | 1,156,160 | (62,426) | 1,640,616 | (200,956) | 2,534,107
Shares issued under restricted stock and purchase plans, net of shares withheld for employee taxes (in shares) |  |  |  |  |  |  | 255,683 |  |  |  |  |
Shares issued under restricted stock and purchase plans, net of shares withheld for employee taxes |  |  |  |  |  |  | $ 3 | 3,277 | 0 | 0 | 0 | 3,280
Accelerated share repurchase (in shares) |  |  |  |  |  |  | (12,517,977) |  |  |  |  |
Share repurchases |  |  |  |  |  |  | $ (103) | 0 | 0 | 0 | (667,969) | (668,072)
Retirement of treasury shares |  |  |  |  |  |  | (23) | (667,946) | 0 | 0 | 667,969 | 0
Stock-based compensation |  |  |  |  |  |  | 0 | 14,467 | 0 | 0 | 0 | 14,467
Net investment hedge currency translation adjustment, net of tax |  |  |  |  |  |  | 0 | 0 | (10,019) | 0 | 0 | (10,019)
Foreign currency translation adjustments |  |  |  |  |  |  | 0 | 0 | 54,278 | 0 | 0 | 54,278
Changes in unrealized losses on marketable securities, net of tax |  |  |  |  |  |  | 0 | 0 | 4,872 | 0 | 0 | 4,872
Net loss |  |  |  |  |  |  | 0 | 0 | 0 | (164,897) | 0 | (164,897)
Actuarial gain on pension plans, net of tax |  |  |  |  |  |  | $ 0 | 0 | (169) | 0 | 0 | (169)
Balance (in shares) at Sep. 30, 2024 |  |  |  |  |  |  | 59,031,953 |  |  |  |  |
Balance at Sep. 30, 2024 |  |  |  |  |  |  | $ 590 | 505,958 | (13,464) | 1,475,719 | (200,956) | 1,767,847
Net loss |  |  |  |  |  |  |  |  |  |  |  | (10,992)
Balance at Dec. 31, 2024 |  |  |  |  |  |  |  |  |  |  |  | 1,720,169
Balance (in shares) at Sep. 30, 2024 |  |  |  |  |  |  | 59,031,953 |  |  |  |  |
Balance at Sep. 30, 2024 |  |  |  |  |  |  | $ 590 | 505,958 | (13,464) | 1,475,719 | (200,956) | 1,767,847
Net loss |  |  |  |  |  |  |  |  |  |  |  | (58,653)
Balance at Mar. 31, 2025 |  |  |  |  |  |  |  |  |  |  |  | 1,695,451
Balance (in shares) at Sep. 30, 2024 |  |  |  |  |  |  | 59,031,953 |  |  |  |  |
Balance at Sep. 30, 2024 |  |  |  |  |  |  | $ 590 | 505,958 | (13,464) | 1,475,719 | (200,956) | 1,767,847
Net loss |  |  |  |  |  |  |  |  |  |  |  | (106,640)
Balance at Jun. 30, 2025 |  |  |  |  |  |  |  |  |  |  |  | 1,673,021
Balance (in shares) at Sep. 30, 2024 |  |  |  |  |  |  | 59,031,953 |  |  |  |  |
Balance at Sep. 30, 2024 |  |  |  |  |  |  | $ 590 | 505,958 | (13,464) | 1,475,719 | (200,956) | 1,767,847
Shares issued under restricted stock and purchase plans, net of shares withheld for employee taxes (in shares) |  |  |  |  |  |  | 288,895 |  |  |  |  |
Shares issued under restricted stock and purchase plans, net of shares withheld for employee taxes |  |  |  |  |  |  | $ 4 | 2,766 | 0 | 0 | 0 | 2,770
Stock-based compensation |  |  |  |  |  |  | 0 | 20,881 | 0 | 0 | 0 | 20,881
Net investment hedge currency translation adjustment, net of tax |  |  |  |  |  |  | 0 | 0 | (30,197) | 0 | 0 | (30,197)
Foreign currency translation adjustments |  |  |  |  |  |  | 0 | 0 | 21,252 | 0 | 0 | 21,252
Changes in unrealized losses on marketable securities, net of tax |  |  |  |  |  |  | 0 | 0 | 476 | 0 | 0 | 476
Net loss |  |  |  |  |  |  | 0 | 0 | 0 | (55,763) | 0 | (55,763)
Actuarial gain on pension plans, net of tax |  |  |  |  |  |  | $ 0 | 0 | (280) | 0 | 0 | (280)
Balance (in shares) at Sep. 30, 2025 |  |  |  |  |  |  | 59,320,848 |  |  |  |  |
Balance at Sep. 30, 2025 |  |  |  |  |  |  | $ 594 | 529,605 | (22,213) | 1,419,956 | (200,956) | 1,726,986
Balance at Dec. 31, 2024 |  |  |  |  |  |  |  |  |  |  |  | 1,720,169
Net loss |  |  |  |  |  |  |  |  |  |  |  | (47,661)
Balance at Mar. 31, 2025 |  |  |  |  |  |  |  |  |  |  |  | 1,695,451
Net loss |  |  |  |  |  |  |  |  |  |  |  | (47,987)
Balance at Jun. 30, 2025 |  |  |  |  |  |  |  |  |  |  |  | 1,673,021
Net loss |  |  |  |  |  |  |  |  |  |  |  | 50,877
Balance (in shares) at Sep. 30, 2025 |  |  |  |  |  |  | 59,320,848 |  |  |  |  |
Balance at Sep. 30, 2025 |  |  |  |  |  |  | $ 594 | $ 529,605 | $ (22,213) | $ 1,419,956 | $ (200,956) | $ 1,726,986

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