Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ (152,824)	$ (97,349)	$ (108,975)
Before Reclassifications	112,279	(52,504)	5,556
Amount Reclassified from AOCI	(1,172)	(2,971)	6,070
Ending Balance	(41,717)	(152,824)	(97,349)
Pension funded status adjustment
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(25,555)	(21,861)	(23,719)
Before Reclassifications	1,692	(4,659)	298
Amount Reclassified from AOCI	1,360	965	1,560
Ending Balance	(22,503)	(25,555)	(21,861)
Net unrealized gain (loss) on derivative instruments
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	1,975	388	(95)
Before Reclassifications	(2,868)	5,523	(4,027)
Amount Reclassified from AOCI	(2,532)	(3,936)	4,510
Ending Balance	(3,425)	1,975	388
Foreign currency translation adjustment
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(129,244)	(75,876)	(85,161)
Before Reclassifications	113,455	(53,368)	9,285
Amount Reclassified from AOCI	0	0	0
Ending Balance	$ (15,789)	$ (129,244)	$ (75,876)