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Treasury Stock - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares of common stock authorized to repurchase | 117,000,000 |  | 117,000,000 |  |  |  |  |
Treasury Stock, Value | $ 853,965,000 |  | $ 853,965,000 |  |  | $ 831,510,000 |  |
Treasury stock, shares | 114,707,570 |  | 114,707,570 |  |  | 114,476,691 |  |
Average price per share of common stock | $ 89.06 |  | $ 97.11 |  |  |  |  |
Common stock, shares outstanding | 51,293,374 |  | 51,293,374 |  |  | 51,359,544 |  |
Purchase of treasury stock, shares | 143,774 |  | 230,879 |  |  |  |  |
Purchase of treasury stock | $ (12,838,000) | $ (9,589,000) | $ (22,455,000) | $ (19,115,000) |  |  |  |
Treasury stock, value, acquired, cost method | $ 12,838,000 | $ 9,589,000 | $ 22,455,000 | $ 19,115,000 |  |  |  |
Treasury stock, shares outstanding | 114,707,570 |  | 114,707,570 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Purchase of treasury stock, shares | 0 | 0 | 0 | 0 |  |  |  |
Purchase of treasury stock | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |
Treasury stock, value, acquired, cost method | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |
Treasury Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock, shares | (114,707,570) | (114,310,320) | (114,707,570) | (114,310,320) | (114,563,796) | (114,476,691) | (114,213,951) | (114,099,537)
Purchase of treasury stock, shares | 143,774 | 96,369 | 230,879 | 210,783 |  |  |  |
Purchase of treasury stock | $ (12,838,000) | $ (9,589,000) | $ (22,455,000) | $ (19,115,000) |  |  |  |
Treasury stock, value, acquired, cost method | 12,838,000 | $ 9,589,000 | 22,455,000 | $ 19,115,000 |  |  |  |
Minimum [Member] | Treasury Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Purchase of treasury stock |  |  | (22,400,000) |  |  |  |  |
Treasury stock, value, acquired, cost method |  |  | 22,400,000 |  |  |  |  |
1996 Repurchase Program [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Treasury Stock, Value | $ 854,000,000 |  | $ 854,000,000 |  |  |  |  |
Treasury stock, shares | 114,707,570 |  | 114,707,570 |  |  |  |  |
Common stock equals to percentage of outstanding common stock |  |  | 69.00% |  |  |  |  |
Average price per share of common stock |  |  | $ 7.44 |  |  |  |  |
Purchase of treasury stock, shares |  |  | 65,104 |  |  |  |  |
Purchase of treasury stock |  |  | $ (4,800,000) |  |  |  |  |
Treasury stock, value, acquired, cost method |  |  | $ 4,800,000 |  |  |  |  |
1996 Repurchase Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Average price per share of common stock |  |  | $ 73.71 |  |  |  |  |

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