Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales	$ 396,646	$ 495,077
Operating costs and expenses:
Cost of sales (exclusive of depreciation shown separately below)	293,678	393,843
Selling, general and administrative	56,251	57,203
Depreciation and amortization	15,431	28,602
Impairment of long-lived assets		252,382
Restructuring	4,485	15,439
Loss on sale of assets and businesses	5,969
Operating Expenses	375,814	747,469
Operating income (loss)	20,832	(252,392)
Non-service defined benefit expense (income)	1,722	(12,416)
Debt extinguishment loss	9,689
Interest expense and other, net	38,558	34,957
Loss from continuing operations before income taxes	(29,137)	(274,933)
Income tax expense	1,214	853
Net loss	$ (30,351)	$ (275,786)
Loss per share—basic:
Net loss	$ (0.47)	$ (5.32)
Weighted average common shares outstanding—basic	64,299	51,860
Loss per share—diluted:
Net loss	$ (0.47)	$ (5.32)
Weighted average common shares outstanding—diluted	64,299	51,860