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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Jul. 31, 2016 | [1] | Apr. 30, 2016 | [1],[2] | Jan. 31, 2016 | [1],[2] | Oct. 31, 2015 | [1],[2] | Jul. 31, 2015 | [1] | Apr. 30, 2015 | [1] | Jan. 31, 2015 | [1] | Oct. 31, 2014 | [1] | Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014
Income From Continuing Operations Before Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income before income taxes | $ 105,985 | $ 116,568 | $ 91,552 | $ 81,760 | $ 81,446 | $ 88,296 | $ 80,104 | $ 82,223 | $ 395,865 | $ 332,069 | $ 270,035
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Income From Continuing Operations Before Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
U.S. |  |  |  |  |  |  |  |  | 339,013 | 286,169 | 230,966
International [Member] |  |  |  |  |  |  |  |  |  |  |
Income From Continuing Operations Before Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
International |  |  |  |  |  |  |  |  | $ 56,852 | $ 45,900 | $ 39,069
[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.
[2] | Net income and earnings per share data were revised from previously reported amounts due to the adoption of ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting. See Note 1 — Summary of Significant Accounting Policies.

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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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