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6. Long-Term Debt (Details) (USD $)
6 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Unsecured Debt [Member]
Senior Notes 4.875% [Member]
Dec. 31, 2013
Unsecured Debt [Member]
Senior Notes 4.875% [Member]
Dec. 31, 2010
Unsecured Debt [Member]
Senior Notes 4.875% [Member]
Mar. 31, 2014
Capital Lease Obligations [Member]
Debt 6 [Member]
Dec. 31, 2013
Capital Lease Obligations [Member]
Debt 6 [Member]
Jun. 30, 2010
Line of Credit [Member]
Mar. 31, 2014
Line of Credit [Member]
Debt Instrument [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage         4.875%        
Long-term debt $ 435,800,000 $ 435,800,000 $ 423,300,000 $ 423,200,000 $ 422,600,000 $ 12,500,000 $ 12,600,000    
Debt Instrument, Interest Rate, Effective Percentage         4.946%        
Less current maturities (200,000) (200,000)              
Face amount of debt sold         425,000,000        
Line of credit maximum borrowing capacity                 200,000,000
Percentage of capital stock of certain foreign subsidiaries securing part of Credit Agreement               65.00%  
Outstanding borrowings                 0
Long-term Debt, Excluding Current Maturities $ 435,611,000 $ 435,615,000