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Debt (Details 3) (USD $)
In Millions, unless otherwise specified
9 Months Ended 0 Months Ended
Nov. 30, 2013
Unsecured state industrial development loan
Nov. 30, 2013
Unsecured state industrial development loan
LIBOR
Nov. 30, 2013
Unsecured state industrial development loan
Maximum
LIBOR
Mar. 02, 2013
MBFC
Maximum
Mar. 02, 2013
Kaz USA
Unsecured state industrial development loan
Mar. 02, 2013
Kaz USA
Unsecured state industrial development loan
After March 1, 2018
Mar. 02, 2013
Kaz USA
Unsecured state industrial development loan
Base Rate Loan
Base rate
Mar. 02, 2013
Kaz USA
Unsecured state industrial development loan
Base Rate Loan
LIBOR
Mar. 02, 2013
Kaz USA
Unsecured state industrial development loan
Base Rate Loan
Federal Funds Rate
Mar. 02, 2013
Kaz USA
Unsecured state industrial development loan
Base Rate Loan
Bank of America's prime rate
Mar. 02, 2013
Kaz USA
Unsecured state industrial development loan
Eurodollar Rate Loans
LIBOR
Mar. 02, 2013
Kaz USA
Unsecured state industrial development loan
Minimum
Base Rate Loan
Base rate
Mar. 02, 2013
Kaz USA
Unsecured state industrial development loan
Minimum
Eurodollar Rate Loans
LIBOR
Mar. 02, 2013
Kaz USA
Unsecured state industrial development loan
Maximum
Base Rate Loan
Base rate
Mar. 02, 2013
Kaz USA
Unsecured state industrial development loan
Maximum
Eurodollar Rate Loans
LIBOR
Long-term debt                              
Taxable industrial development revenue bonds       $ 38.00                      
Face amount 38                            
Interim draws, maximum         38.00                    
Variable Rate Basis   LIBOR         Base rate one-, two-, three-, or six-month LIBOR federal funds prime rate of Bank of America one-, two-, three-, or six-month LIBOR        
Margin (as a percent)     2.125%         1.00% 0.50%     0.00% 1.00% 1.125% 2.125%
Outstanding principal payable on March 1, 2014         1.90                    
Outstanding principal payable on March 1, 2015         1.90                    
Outstanding principal payable on March 1, 2016         3.80                    
Outstanding principal payable on March 1, 2017         5.70                    
Outstanding principal payable on March 1, 2018         1.90                    
Outstanding principal payable on March 1, 2019         1.90                    
Outstanding principal payable on March 1, 2020         1.90                    
Outstanding principal payable on March 1, 2021         1.90                    
Outstanding principal payable on March 1, 2022         1.90                    
Outstanding principal payable on March 1, 2023         $ 15.20                    
Notice period for prepayment of debt by Bank of America, N.A.           90 days