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Condensed Consolidating Balance Sheet (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Current Assets -      
Cash and Cash Equivalents $ 17,060 $ 9,315  
Restricted Cash   38,753  
Accounts and Notes Receivable 133,873 141,685  
Inventories 251,260 258,159  
Income Tax Receivable 314 5,750  
Prepaid and Other Current Assets 6,966 5,073  
Total Current Assets 409,473 458,735  
Property, Plant, and Equipment - 2,659,148 2,586,528  
Less: Accumulated Depreciation (1,031,996) (991,229)  
Property, Plant, and Equipment, net 1,627,152 1,595,299  
Notes Receivable 3,022 115  
Investment in Joint Venture 61,988 60,558  
Goodwill and Intangible Assets, net 236,936 239,342  
Other Assets 16,845 13,954  
Total Assets 2,355,416 2,368,003  
Current Liabilities -      
Accounts Payable 77,611 73,459  
Accrued Liabilities 66,921 105,870  
Current Portion of Long-term Debt 36,500    
Total Current Liabilities 181,032 179,329  
Long-term Debt 589,924 620,922  
Other Long-term Liabilities 30,554 31,096  
Deferred Income Taxes 133,569 118,966  
Total Liabilities 935,079 950,313  
Total Stockholders’ Equity 1,420,337 1,417,690 $ 1,203,450
Liabilities and Stockholders' Equity, Total 2,355,416 2,368,003  
Eliminations [Member]      
Current Assets -      
Income Tax Receivable   (103,760)  
Total Current Assets   (103,760)  
Investments in Subsidiaries and Receivables from Affiliates (2,900,511) (3,481,149)  
Total Assets (2,900,511) (3,584,909)  
Current Liabilities -      
Income Tax Payable   (103,760)  
Total Current Liabilities   (103,760)  
Payables to Affiliates (6,192,150) (6,370,576)  
Total Liabilities (6,192,150) (6,474,336)  
Total Stockholders’ Equity 3,291,639 2,889,427  
Liabilities and Stockholders' Equity, Total (2,900,511) (3,584,909)  
Parent [Member] | Reportable Legal Entities [Member]      
Current Assets -      
Cash and Cash Equivalents 15,502 5,784  
Restricted Cash   38,753  
Accounts and Notes Receivable 453 407  
Income Tax Receivable 314 109,510  
Prepaid and Other Current Assets 1,075 665  
Total Current Assets 17,344 155,119  
Property, Plant, and Equipment - 7,310 3,188  
Less: Accumulated Depreciation (369) (1,089)  
Property, Plant, and Equipment, net 6,941 2,099  
Investment in Joint Venture 70 70  
Investments in Subsidiaries and Receivables from Affiliates 2,476,986 2,718,809  
Other Assets 4,311 5,417  
Total Assets 2,505,652 2,881,514  
Current Liabilities -      
Accounts Payable 6,490 5,591  
Accrued Liabilities 24,096 67,387  
Current Portion of Long-term Debt 36,500    
Total Current Liabilities 67,086 72,978  
Long-term Debt 589,924 620,922  
Other Long-term Liabilities 11 124  
Payables to Affiliates 423,525 762,340  
Deferred Income Taxes 4,769 7,460  
Total Liabilities 1,085,315 1,463,824  
Total Stockholders’ Equity 1,420,337 1,417,690  
Liabilities and Stockholders' Equity, Total 2,505,652 2,881,514  
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]      
Current Assets -      
Cash and Cash Equivalents 1,558 3,531  
Accounts and Notes Receivable 133,420 141,278  
Inventories 251,260 258,159  
Prepaid and Other Current Assets 5,891 4,408  
Total Current Assets 392,129 407,376  
Property, Plant, and Equipment - 2,651,838 2,583,340  
Less: Accumulated Depreciation (1,031,627) (990,140)  
Property, Plant, and Equipment, net 1,620,211 1,593,200  
Notes Receivable 3,022 115  
Investment in Joint Venture 61,918 60,488  
Investments in Subsidiaries and Receivables from Affiliates 423,525 762,340  
Goodwill and Intangible Assets, net 236,936 239,342  
Other Assets 12,534 8,537  
Total Assets 2,750,275 3,071,398  
Current Liabilities -      
Accounts Payable 71,121 67,868  
Accrued Liabilities 42,825 38,483  
Income Tax Payable   103,760  
Total Current Liabilities 113,946 210,111  
Other Long-term Liabilities 30,543 30,972  
Payables to Affiliates 5,768,625 5,608,236  
Deferred Income Taxes 128,800 111,506  
Total Liabilities 6,041,914 5,960,825  
Total Stockholders’ Equity (3,291,639) (2,889,427)  
Liabilities and Stockholders' Equity, Total $ 2,750,275 $ 3,071,398