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Pension Plan and Retirement Benefits (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Minimum
     
Asset allocation      
Equity risk premium above broad bond market yields (as a percent) 3.00%    
Broad bond market yields (as a percent) 5.00%    
Maximum
     
Asset allocation      
Equity risk premium above broad bond market yields (as a percent) 4.00%    
Broad bond market yields (as a percent) 7.00%    
Amount of adjustment to target allocation (as a percent) 10.00%    
Bonds
     
Asset allocation      
Actual plan asset allocation (as a percent) 38.00%    
Target plan asset allocation (as a percent) 40.00%    
Common /collective funds, Short-term money market
     
Fair value measurement of plan assets      
Total pension plan assets $ 182,011 $ 148,931  
Equity
     
Asset allocation      
Actual plan asset allocation (as a percent) 58.00%    
Target plan asset allocation (as a percent) 60.00%    
Real estate and Other
     
Asset allocation      
Target plan asset allocation (as a percent) 0.00%    
Other
     
Asset allocation      
Actual plan asset allocation (as a percent) 4.00%    
Level 1 Active Markets for Identical Assets
     
Fair value measurement of plan assets      
Total pension plan assets 45,964 30,815  
Level 2 Other Observable Inputs
     
Fair value measurement of plan assets      
Total pension plan assets 136,047 118,116  
Defined Benefit Pension Plans
     
Fair value measurement of plan assets      
Total pension plan assets 182,011 148,931 144,976
Expected benefit payments      
2013 13,052    
2014 13,346    
2015 13,700    
2016 14,098    
2017 14,560    
2018-2021 (in total) 80,615    
Domestic pension plans
     
Fair value measurement of plan assets      
Total pension plan assets 166,285 135,723  
Asset allocation      
Plan's return on assets assumption (as a percent) 8.00% 8.50% 8.50%
Expected benefit payments      
2013 15,000    
Domestic pension plans | Mutual fund
     
Fair value measurement of plan assets      
Total pension plan assets 30,238 17,607  
Domestic pension plans | Bonds
     
Fair value measurement of plan assets      
Total pension plan assets 62,554 57,883  
Domestic pension plans | Common /collective funds, Short-term money market
     
Fair value measurement of plan assets      
Total pension plan assets 6,762 2,418  
Domestic pension plans | Common /collective funds, U.S. common stock
     
Fair value measurement of plan assets      
Total pension plan assets 67,080 51,753  
Domestic pension plans | Common /collective funds, International equity
     
Fair value measurement of plan assets      
Total pension plan assets 7,053 6,062  
Domestic pension plans | Level 1 Active Markets for Identical Assets
     
Fair value measurement of plan assets      
Total pension plan assets 22,836 17,607  
Domestic pension plans | Level 1 Active Markets for Identical Assets | Mutual fund
     
Fair value measurement of plan assets      
Total pension plan assets 22,836 17,607  
Domestic pension plans | Level 1 Active Markets for Identical Assets | Common /collective funds, U.S. common stock
     
Fair value measurement of plan assets      
Total pension plan assets 7,402    
Domestic pension plans | Level 2 Other Observable Inputs
     
Fair value measurement of plan assets      
Total pension plan assets 136,047 118,116  
Domestic pension plans | Level 2 Other Observable Inputs | Bonds
     
Fair value measurement of plan assets      
Total pension plan assets 62,554 57,883  
Domestic pension plans | Level 2 Other Observable Inputs | Common /collective funds, Short-term money market
     
Fair value measurement of plan assets      
Total pension plan assets 6,762 2,418  
Domestic pension plans | Level 2 Other Observable Inputs | Common /collective funds, U.S. common stock
     
Fair value measurement of plan assets      
Total pension plan assets 59,678 51,753  
Domestic pension plans | Level 2 Other Observable Inputs | Common /collective funds, International equity
     
Fair value measurement of plan assets      
Total pension plan assets 7,053 6,062  
U.K. pension plan
     
Fair value measurement of plan assets      
Total pension plan assets 15,726 13,208  
Asset allocation      
Plan's return on assets assumption (as a percent) 5.90% 5.90% 6.20%
Expected benefit payments      
2013 970    
U.K. pension plan | Bonds
     
Fair value measurement of plan assets      
Total pension plan assets 7,297 5,547  
U.K. pension plan | Equity
     
Fair value measurement of plan assets      
Total pension plan assets 6,322 6,076  
U.K. pension plan | Other
     
Fair value measurement of plan assets      
Total pension plan assets 2,107 1,585  
U.K. pension plan | Level 1 Active Markets for Identical Assets
     
Fair value measurement of plan assets      
Total pension plan assets 15,726 13,208  
U.K. pension plan | Level 1 Active Markets for Identical Assets | Bonds
     
Fair value measurement of plan assets      
Total pension plan assets 7,297 5,547  
U.K. pension plan | Level 1 Active Markets for Identical Assets | Equity
     
Fair value measurement of plan assets      
Total pension plan assets 6,322 6,076  
U.K. pension plan | Level 1 Active Markets for Identical Assets | Other
     
Fair value measurement of plan assets      
Total pension plan assets 2,107 1,585  
Postretirement Health Care Benefits
     
Expected benefit payments      
2013 5,000    
2014 5,000    
2015 5,000    
2016 5,000    
2017 5,000    
2018-2021 (in total) $ 25,000