Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 2,784,813	$ 2,811,380
Accumulated Depreciation	(1,125,713)	(1,054,963)
Property, Plant and Equipment, Net	1,659,100	1,756,417
Land And Quarries [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	217,439	231,163
Plants [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	2,363,937	2,353,526
Buildings Machinery And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	180,340	196,285
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 23,097	$ 30,406