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Quarterly Information (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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.

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