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Financial Instruments and Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Sep. 30, 2011
Mar. 31, 2011
Sep. 30, 2010
Financial Instruments and Fair Value Measurements        
Cash and cash equivalents, Estimated Fair Value $ 56,329 $ 74,539    
Investments in deferred compensation program, Estimated Fair Value 7,221 5,855    
Short-term borrowings, Estimated Fair Value (32,500) 0    
Long-term debt, including current portion, Estimated Fair Value (464,137) (482,776)    
Cash and cash equivalents, Carrying Cost 56,329 74,539 60,819 105,579
Investments in deferred compensation program, Carrying Cost 7,221 5,855    
Short-term borrowings, Carrying Cost (32,500) 0    
Long-term debt, including current portion, Carrying Cost $ (410,728) $ (425,246)