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Stockholders’ Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Dec. 07, 2018 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Class of Stock [Line Items] |  |  |  |
Preferred stock, shares authorized (in shares) |  | 1,000,000 | 1,000,000 |
Preferred stock, par value (usd per share) |  | $ 0.01 | $ 0.01 |
Preferred stock, shares issued (in shares) |  | 0 | 0 |
Preferred stock, shares outstanding (in shares) |  | 0 | 0 |
Number of shares of common stock purchased |  | 0 | 581,140 | 726,347
Repurchased common stock value |  |  | $ 34,561 | $ 56,436
Treasury stock, shares (in shares) |  | 12,799,790 | 12,791,503 |
Shares issued in ESPP (USD per share) |  | $ 62.55 | $ 62.55 |
Alpha |  |  |  |
Class of Stock [Line Items] |  |  |  |
Initial purchase consideration | $ 750,000 |  |  |
Payments to acquire businesses | $ 650,000 |  |  |
Shares issued in acquisition (USD per share) | $ 84.92 |  |  |
Fair value of shares issued for net assets acquired | $ 93,268 |  |  |
Common Stock | Alpha |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares issued in acquisition (in shares) | 1,177,630 |  |  |
Shares issued in employee stock purchase plan (in shares) |  | 13,465 | 17,410 | 3,256

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