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Quarterly Information (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Jul. 31, 2013
Apr. 30, 2013
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Jul. 01, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                        
Revenues $ 263,697 [1] $ 277,638 [1] $ 266,185 [1] $ 238,866 [1] $ 226,556 [1] $ 226,556 [1] $ 244,105 [1] $ 227,904 [1] $ 225,626 [1] $ 1,046,386 $ 924,191 $ 872,246
Operating income 63,052 [1] 82,813 [1] 62,770 [1] 74,357 [1] 69,494 [1]   87,944 [1] 63,539 [1] 65,376 [1] 282,992 286,353 265,290
Total income before taxes 62,162 [1] 82,005 [1] 61,117 [1] 71,588 [1] 67,478 [1]   84,547 [1] 62,216 [1] 63,815 [1] 276,872 278,056 263,877
Net income $ 41,304 [1] $ 53,236 [1] $ 39,640 [1] $ 45,845 [1] $ 44,896 [1]   $ 55,471 [1] $ 40,603 [1] $ 41,149 [1] $ 180,025 $ 182,119 $ 166,375
Basic net income per share (in dollars per share) $ 0.33 [1] $ 0.42 [1] $ 0.32 [1] $ 0.37 [1] $ 0.36 [1]   $ 0.44 [1] $ 0.32 [1] $ 0.32 [1] $ 1.44 $ 1.42 $ 1.10
Diluted net income per share(in dollars per share) $ 0.32 [1] $ 0.41 [1] $ 0.31 [1] $ 0.36 [1] $ 0.35 [1]   $ 0.43 [1] $ 0.31 [1] $ 0.31 [1] $ 1.39 $ 1.39 $ 1.08
[1] Earnings per share were computed independently for each of the periods presented; therefore, the sum of the earnings per share amounts for the quarters may not equal the total for the year.