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6. Long-Term Debt (Details) (USD $)
 9 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2012
Subordinated Debt [Member]
Senior Subordinated Notes 8.0% [Member]
Dec. 31, 2011
Subordinated Debt [Member]
Senior Subordinated Notes 8.0% [Member]
Mar. 31, 2012
Unsecured Debt [Member]
Senior Notes 4.875% [Member]
Dec. 31, 2011
Unsecured Debt [Member]
Senior Notes 4.875% [Member]
Mar. 31, 2012
Capital Lease Obligations [Member]
Dec. 31, 2011
Capital Lease Obligations [Member]
Sep. 30, 2010
Line of Credit [Member]
Mar. 31, 2012
Line of Credit [Member]
Debt Instrument [Line Items]                    
Long-term debt $ 732,300,000 $ 732,300,000 $ 296,400,000 $ 296,300,000 $ 422,900,000 $ 422,800,000 $ 13,000,000 $ 13,200,000    
Less current maturities (400,000) (600,000)                
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 $ 731,899,000 $ 731,698,000