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Condensed Consolidating Balance Sheet (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Mar. 31, 2017
Current Assets -      
Cash and Cash Equivalents $ 14,334 $ 9,315  
Restricted Cash 38,753 38,753  
Accounts and Notes Receivable 184,083 141,685  
Inventories 241,000 258,159  
Income Tax Receivable 7,315 5,750  
Prepaid and Other Current Assets 8,304 5,073  
Total Current Assets 493,789 458,735  
Property, Plant, and Equipment - 2,627,261 2,586,528  
Less: Accumulated Depreciation (1,009,726) (991,229)  
Property, Plant, and Equipment, net 1,617,535 1,595,299  
Notes Receivable 3,266 115  
Investment in Joint Venture 60,309 60,558  
Goodwill and Intangible Assets, net 238,541 239,342  
Other Assets 13,535 13,954  
Total Assets 2,426,975 2,368,003  
Current Liabilities -      
Accounts Payable 93,182 73,459  
Accrued Liabilities 95,910 105,870  
Total Current Liabilities 189,092 179,329  
Long-term Debt 651,090 620,922  
Other Long-term Liabilities 30,158 31,096  
Deferred Income Taxes 125,156 118,966  
Total Liabilities 995,496 950,313  
Total Stockholders’ Equity 1,431,479 1,417,690 $ 1,203,450
Liabilities and Stockholders' Equity, Total 2,426,975 2,368,003  
Eliminations [Member]      
Current Assets -      
Income Tax Receivable   (103,760)  
Total Current Assets   (103,760)  
Investments in Subsidiaries and Receivables from Affiliates (2,457,391) (3,481,149)  
Total Assets (2,457,391) (3,584,909)  
Current Liabilities -      
Total Current Liabilities   (103,760)  
Income Tax Payable   (103,760)  
Payables to Affiliates (5,905,570) (6,370,576)  
Total Liabilities (5,905,570) (6,474,336)  
Total Stockholders’ Equity 3,448,179 2,889,427  
Liabilities and Stockholders' Equity, Total (2,457,391) (3,584,909)  
Parent [Member]      
Current Assets -      
Cash and Cash Equivalents 10,325 5,784  
Restricted Cash 38,753 38,753  
Accounts and Notes Receivable 1,057 407  
Income Tax Receivable 7,315 109,510  
Prepaid and Other Current Assets 362 665  
Total Current Assets 57,812 155,119  
Property, Plant, and Equipment - 3,215 3,188  
Less: Accumulated Depreciation (1,127) (1,089)  
Property, Plant, and Equipment, net 2,088 2,099  
Investment in Joint Venture 70 70  
Investments in Subsidiaries and Receivables from Affiliates 2,273,998 2,718,809  
Other Assets 4,507 5,417  
Total Assets 2,338,475 2,881,514  
Current Liabilities -      
Accounts Payable 6,305 5,591  
Accrued Liabilities 59,355 67,387  
Total Current Liabilities 65,660 72,978  
Long-term Debt 651,090 620,922  
Other Long-term Liabilities 72 124  
Payables to Affiliates 183,393 762,340  
Deferred Income Taxes 6,781 7,460  
Total Liabilities 906,996 1,463,824  
Total Stockholders’ Equity 1,431,479 1,417,690  
Liabilities and Stockholders' Equity, Total 2,338,475 2,881,514  
Guarantor Subsidiaries [Member]      
Current Assets -      
Cash and Cash Equivalents 4,009 3,531  
Accounts and Notes Receivable 183,026 141,278  
Inventories 241,000 258,159  
Prepaid and Other Current Assets 7,942 4,408  
Total Current Assets 435,977 407,376  
Property, Plant, and Equipment - 2,624,046 2,583,340  
Less: Accumulated Depreciation (1,008,599) (990,140)  
Property, Plant, and Equipment, net 1,615,447 1,593,200  
Notes Receivable 3,266 115  
Investment in Joint Venture 60,239 60,488  
Investments in Subsidiaries and Receivables from Affiliates 183,393 762,340  
Goodwill and Intangible Assets, net 238,541 239,342  
Other Assets 9,028 8,537  
Total Assets 2,545,891 3,071,398  
Current Liabilities -      
Accounts Payable 86,877 67,868  
Accrued Liabilities 36,555 38,483  
Total Current Liabilities 123,432 210,111  
Income Tax Payable   103,760  
Other Long-term Liabilities 30,086 30,972  
Payables to Affiliates 5,722,177 5,608,236  
Deferred Income Taxes 118,375 111,506  
Total Liabilities 5,994,070 5,960,825  
Total Stockholders’ Equity (3,448,179) (2,889,427)  
Liabilities and Stockholders' Equity, Total $ 2,545,891 $ 3,071,398