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Acquisitions - Additional Information (Detail) |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 07, 2018 USD ($) $ / shares shares | Dec. 30, 2018 USD ($) | Mar. 31, 2019 USD ($) shares | Mar. 31, 2018 USD ($) acquisition | Mar. 31, 2017 USD ($) acquisition
Business Acquisition [Line Items] |  |  |  |  |
Number of businesses acquired | acquisition |  |  |  | 0 | 0
Purchase of businesses |  |  | $ 654,614,000 | $ 2,988,000 | $ 12,392,000
Goodwill relating to acquisitions |  |  | 320,618,000 | 3,670,000 |
Estimated tax-deductible goodwill |  |  | $ 58,699,000 | $ 18,147,000 |
Shares issued in acquisition (in shares) | shares |  |  | 1,177,630 |  |
Closing day spot rate (USD per share) | $ / shares | $ 79.20 |  |  |  |
Alpha |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Initial purchase consideration | $ 750,000,000 |  |  |  |
Consideration transferred | 742,502,000 |  |  |  |
Acquisition cost expensed |  |  | $ 12,883,000 |  |
Estimated tax-deductible goodwill |  |  | 42,262,000 |  |
Inventory adjustment |  |  | 7,263,000 |  |
Payments to acquire businesses | 650,000,000 |  |  |  |
Shares issued in acquisition, value | 93,268,000 |  |  |  |
Working capital adjustment | $ 766,000 |  |  |  |
Shares issued in acquisition (USD per share) | $ / shares | $ 84.92 |  |  |  |
Revenues and gains recognized in acquisition |  |  | 162,454,000 |  |
Expenses and losses recognized in acquisition |  |  | 1,252,000 |  |
Alpha | Customer relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired intangible assets | $ 221,000,000 |  |  |  |
Minimum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated useful lives of finite-lived assets |  |  |  | 3 years |
Maximum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration transferred |  | $ 250,000,000 |  |  |
Estimated useful lives of finite-lived assets |  |  |  | 20 years |
Trademarks | Alpha |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired indefinite-lived intangible assets | $ 56,000,000 |  |  |  |
Common Stock | Alpha |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Shares issued in acquisition (in shares) | shares | 1,177,630 |  |  |  |
Operating Expense | Alpha |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition cost expensed |  |  | $ 12,883,000 |  |

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