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Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ (41,717)	$ (152,824)	$ (97,349)
Before Reclassifications	(114,029)	112,279	(52,504)
Amount Reclassified from AOCI	13,064	(1,172)	(2,971)
Ending Balance	(142,682)	(41,717)	(152,824)
Pension funded status adjustment
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(22,503)	(25,555)	(21,861)
Before Reclassifications	339	1,692	(4,659)
Amount Reclassified from AOCI	1,373	1,360	965
Ending Balance	(20,791)	(22,503)	(25,555)
Net unrealized gain (loss) on derivative instruments
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(3,425)	1,975	388
Before Reclassifications	(8,396)	(2,868)	5,523
Amount Reclassified from AOCI	11,691	(2,532)	(3,936)
Ending Balance	(130)	(3,425)	1,975
Foreign currency translation adjustment
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(15,789)	(129,244)	(75,876)
Before Reclassifications	(105,972)	113,455	(53,368)
Amount Reclassified from AOCI	0	0	0
Ending Balance	$ (121,761)	$ (15,789)	$ (129,244)

X

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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