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Subsequent Events (Details) (USD $)
0 Months Ended1 Months Ended10 Months Ended
Oct. 19, 2011
Nov. 09, 2011
Nov. 09, 2011
Sep. 30, 2011
Sep. 30, 2010
Subsequent Event [Line Items]     
Stock repurchase, amount$ 100,000,000    
Stock repurchased during period, shares  0  
Number of acquisitions 2   
Aggregate purchase price of acquisitions   126,462,000142,321,000
Potential purchase price of acquisitions   3,781,000710,000
Maximum [Member]
     
Subsequent Event [Line Items]     
Potential purchase price of acquisitions 86,400,00086,400,000  
Minimum [Member]
     
Subsequent Event [Line Items]     
Aggregate purchase price of acquisitions $ 57,600,000 57,600,000