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v3.19.1

Stockholders' Equity and Noncontrolling Interests - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Dec. 07, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Class of Stock [Line Items] |  |  |
Nonvested stock, weighted average remaining contractual term |  | 20 months |
Preferred stock, shares issued (in shares) |  | 0 | 0
Preferred stock, shares outstanding (in shares) |  | 0 | 0
Preferred stock, shares authorized (in shares) |  | 1,000,000 | 1,000,000
Preferred stock, par value (usd per share) |  | $ 0.01 | $ 0.01
Number of shares of common stock purchased |  | 726,347 | 1,756,831
Repurchased common stock value |  | $ 56,436 | $ 121,191
Treasury stock, shares (in shares) |  | 12,227,773 | 12,680,105
Shares issued in ESPP (USD per share) |  | $ 62.55 |
Shares issued in acquisition (in shares) |  | 1,177,630 |
Accelerated Share Repurchase Agreement [Member] |  |  |
Class of Stock [Line Items] |  |  |
Stock Repurchased and Retired During Period, Shares |  |  | 1,495,714
Accelerated Share Repurchases, Settlement (Payment) or Receipt |  |  | $ 100,000
Accelerated Share Repurchases, Final Price Paid Per Share |  |  | $ 66.86
Alpha |  |  |
Class of Stock [Line Items] |  |  |
Initial purchase consideration | $ 750,000 |  |
Payments to acquire businesses | 650,000 |  |
Shares issued in acquisition, value | $ 93,268 |  |
Shares issued in acquisition (USD per share) | $ 84.92 |  |
Common Stock | Alpha |  |  |
Class of Stock [Line Items] |  |  |
Shares issued in employee stock purchase plan (in shares) |  | 3,256 |
Shares issued in acquisition (in shares) | 1,177,630 |  |

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