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Condensed Consolidating Balance Sheet (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Mar. 31, 2015
Current Assets -        
Cash and Cash Equivalents $ 9,180 $ 5,391 $ 7,551 $ 7,514
Accounts and Notes Receivable 142,298 120,221    
Inventories 240,999 243,595    
Income Tax Receivable   5,623    
Prepaid and Other Current Assets 8,020 5,173    
Total Current Assets 400,497 380,003    
Property, Plant and Equipment - 2,083,592 2,072,776    
Less: Accumulated Depreciation (837,242) (817,465)    
Property, Plant and Equipment, net 1,246,350 1,255,311    
Notes Receivable 2,652 2,672    
Investment in Joint Venture 48,700 49,465    
Goodwill and Intangible Assets, net 163,298 165,827    
Other Assets 27,588 30,357    
Total Assets 1,889,085 1,883,635    
Current Liabilities -        
Accounts Payable 61,322 66,614    
Accrued Liabilities 40,509 45,975    
Income Taxes Payable 9,919      
Current Portion of Long-term Debt 8,000 8,000    
Total Current Liabilities 119,750 120,589    
Long-term Debt 490,714 499,714    
Other Long-term Liabilities 58,642 61,122    
Deferred Income Taxes 163,536 161,679    
Total Liabilities 832,642 843,104    
Total Stockholders’ Equity 1,056,443 1,040,531    
Liabilities and Stockholders' Equity, Total 1,889,085 1,883,635    
Eliminations [Member]        
Current Assets -        
Income Tax Receivable (17,349) (1,108)    
Total Current Assets (17,349) (1,108)    
Deferred Income Taxes (3,974) (3,375)    
Investments in Subsidiaries and Receivables from Affiliates (6,902,288) (6,615,286)    
Total Assets (6,923,611) (6,619,769)    
Current Liabilities -        
Income Taxes Payable (17,349) (1,108)    
Total Current Liabilities (17,349) (1,108)    
Payables to Affiliates (4,816,023) (4,572,113)    
Deferred Income Taxes (3,974) (3,375)    
Total Liabilities (4,837,346) (4,576,596)    
Total Stockholders’ Equity (2,086,265) (2,043,173)    
Liabilities and Stockholders' Equity, Total (6,923,611) (6,619,769)    
Parent [Member]        
Current Assets -        
Cash and Cash Equivalents 4,208 3,507 4,482 3,644
Accounts and Notes Receivable 1,135 324    
Income Tax Receivable 17,349      
Prepaid and Other Current Assets 1,485 1,365    
Total Current Assets 24,177 5,196    
Property, Plant and Equipment - 2,613 2,612    
Less: Accumulated Depreciation (842) (814)    
Property, Plant and Equipment, net 1,771 1,798    
Deferred Income Taxes 3,974 3,375    
Investment in Joint Venture 37 33    
Investments in Subsidiaries and Receivables from Affiliates 4,219,567 4,085,806    
Other Assets 5,473 5,557    
Total Assets 4,254,999 4,101,765    
Current Liabilities -        
Accounts Payable 6,320 6,968    
Accrued Liabilities 10,563 15,708    
Income Taxes Payable   1,108    
Current Portion of Long-term Debt 8,000 8,000    
Total Current Liabilities 24,883 31,784    
Long-term Debt 490,714 499,714    
Other Long-term Liabilities 239 256    
Payables to Affiliates 2,682,720 2,529,480    
Total Liabilities 3,198,556 3,061,234    
Total Stockholders’ Equity 1,056,443 1,040,531    
Liabilities and Stockholders' Equity, Total 4,254,999 4,101,765    
Guarantor Subsidiaries [Member]        
Current Assets -        
Cash and Cash Equivalents 4,972 1,884 $ 2,709 $ 3,870
Accounts and Notes Receivable 141,163 119,897    
Inventories 240,999 243,595    
Income Tax Receivable   6,731    
Prepaid and Other Current Assets 6,535 3,808    
Total Current Assets 393,669 375,915    
Property, Plant and Equipment - 2,080,979 2,070,164    
Less: Accumulated Depreciation (836,400) (816,651)    
Property, Plant and Equipment, net 1,244,579 1,253,513    
Notes Receivable 2,652 2,672    
Investment in Joint Venture 48,663 49,432    
Investments in Subsidiaries and Receivables from Affiliates 2,682,721 2,529,480    
Goodwill and Intangible Assets, net 163,298 165,827    
Other Assets 22,115 24,800    
Total Assets 4,557,697 4,401,639    
Current Liabilities -        
Accounts Payable 55,002 59,646    
Accrued Liabilities 29,946 30,267    
Income Taxes Payable 27,268      
Total Current Liabilities 112,216 89,913    
Other Long-term Liabilities 58,403 60,866    
Payables to Affiliates 2,133,303 2,042,633    
Deferred Income Taxes 167,510 165,054    
Total Liabilities 2,471,432 2,358,466    
Total Stockholders’ Equity 2,086,265 2,043,173    
Liabilities and Stockholders' Equity, Total $ 4,557,697 $ 4,401,639