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Stockholders' Equity (Details) (USD $)
 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jan. 31, 2014
Oct. 31, 2013
Jan. 31, 2014
Jan. 31, 2013
Mar. 06, 2014
Subsequent
Jan. 31, 2014
Quarterly Dividend - First
Jan. 31, 2014
Quarterly Dividend - Second
Jan. 31, 2014
Dividend Declared Third
Subsequent
Stock Repurchase Program                
Shares acquired     935,992 397,798        
Average price per share of shares repurchased on the open market     $ 31.10 $ 26.34        
Aggregate cost including transaction costs     $ 29,107,000 $ 10,477,000        
Stock Repurchase Program Authorization Date     Dec. 09, 2013 Dec. 06, 2012        
Maximum amount authorized by the Board of Directors for repurchases of the company's common stock     100,000,000 50,000,000        
Stock repurchase program, remaining authorized repurchase amount     $ 55,247,000   $ 44,000,000      
Dividends                
Targeted annual dividend per share $ 1.20 $ 1.10            
Date declared     Dec. 09, 2013     Oct. 03, 2013 Dec. 09, 2013 Mar. 06, 2014
Date of record     Jan. 17, 2014         May 07, 2014
Date paid           Nov. 19, 2013 Feb. 19, 2014 May 30, 2014
Quarterly dividend payment amount per share           $ 0.275 $ 0.30 $ 0.30