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Actual and Pro Forma Impact on Net Sales and Operating Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Revenue	$ 404,667	$ 342,904	$ 1,279,340	$ 1,098,838
Operating Earnings	123,462	$ 103,903	366,981	$ 312,806
Kosmos Acquisition [Member] | Pro Forma [Member]
Business Acquisition [Line Items]
Revenue	45,407		142,980
Operating Earnings	$ 13,316		$ 38,286

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