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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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