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Actual and Pro Forma Impact on Net Sales and Operating Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Revenue	$ 447,684	$ 400,569	$ 874,673	$ 755,934
Operating Earnings	133,426	$ 121,377	243,519	$ 208,903
Kosmos Acquisition [Member] | Pro Forma [Member]
Business Acquisition [Line Items]
Revenue	50,018		97,573
Operating Earnings	$ 14,410		$ 24,970

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