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Financial Instruments and Fair Value Measurements (Tables)
9 Months Ended
Jun. 30, 2011
Financial Instruments and Fair Value Measurements  
Estimated Fair Values of Financial Instruments
                                 
    At June 30, 2011     At September 30, 2010  
    Estimated Fair             Estimated Fair        
    Value     Carrying Cost     Value     Carrying Cost  
Cash and cash equivalents
  $ 72,598     $ 72,598     $ 105,579     $ 105,579  
Investments in deferred compensation program
    6,486       6,486       5,633       5,633  
Short-term borrowings
    (41,577 )     (41,577 )     (22,099 )     (22,099 )
Long-term debt, including current portion
    (482,374 )     (427,190 )     (506,120 )     (443,673 )
Schedule of Weighted Average Interest Rates Used to Calculate Long-Term Debt Fair Value
                 
    June 30,     September 30,  
    2011     2010  
Weighted-average interest rate used to estimate fair value
    2.7 %     2.9 %
Financial Assets that are Measured at Fair Value on a Recurring Basis
                                                                 
    At June 30, 2011     At September 30, 2010  
    Level 1     Level 2     Level 3     Total     Level 1     Level 2     Level 3     Total  
Financial assets:
                                                               
Investments in money market funds
  $ 8,444     $     $     $ 8,444     $ 50,360     $     $     $ 50,360  
Equity securities
    6,486                   6,486       5,633                   5,633  
Foreign exchange forward contract
                                  579             579  
 
                                               
Total financial assets
  $ 14,930     $     $     $ 14,930     $ 55,993     $ 579     $     $ 56,572