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Stockholder's Investments - Summary of Activity under Company's Share-Based Compensation Plans (Detail) - USD ($) | 12 Months Ended
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Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested | $ 19,100 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $ 6,512 | $ 2,797 |
Options Outstanding, Beginning Balance, Price Lower Range | $ 19.96 |  |
Options Outstanding, Beginning Balance, Price Upper Range | 38.31 |  |
Options Granted, Price Lower Range | 32.83 |  |
Options Granted, Price Upper Range | 38.83 |  |
Options Exercised, Price Lower Range | 19.96 |  |
Options Exercised, Price Upper Range | 38.31 |  |
Options Cancelled, Price Lower Range | 19.96 |  |
Options Cancelled, Price Upper Range | 38.31 |  |
Options Outstanding, Ending Balance, Price Lower Range | 19.96 | $ 19.96 |
Options Outstanding, Ending Balance, Price Upper Range | $ 38.83 | $ 38.31 |
Options, Outstanding [Roll Forward] |  |  |
Shares Outstanding, Beginning Balance | 3,708,706 |  |
Options Granted | 378,939 |  |
Options Exercised | (874,128) |  |
Options Cancelled | (333,716) |  |
Shares Outstanding, Ending Balance | 2,879,801 | 3,708,706 |
Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |
Options Outstanding, Beginning Balance, Weighted Average Exercise Price | $ 27.34 |  |
Options Granted, Weighted Average Exercise Price | 35.14 | $ 20.02 | $ 22.76
Options Exercised, Weighted Average Exercise Price | 27.81 |  |
Options Cancelled, Weighted Average Exercise Price | 34.29 |  |
Options Outstanding, Ending Balance, Weighted Average Exercise Price | $ 27.40 | 27.34 |
Options Outstanding, Range of Exercise Prices [Abstract] |  |  |
Exercise Price Range, Number of Outstanding Options | 2,879,801 |  |
Exercise Price Range, Options Outstanding, Weighted Average Remaining Contractual Term | 5 years 10 months 24 days |  |
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price | $ 27.83 |  |
Exercise Price Range, Number of Exercisable Options | 1,859,959 |  |
Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term | 4 years 6 months |  |
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price | $ 28.20 |  |
Restricted Shares and RSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |
Restricted Shares and RSUs, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 20.07 |
$20.95 - $26.99 [Member] |  |  |
Options Outstanding, Range of Exercise Prices [Abstract] |  |  |
Exercise Price Range, Number of Outstanding Options | 1,091,151 |  |
Exercise Price Range, Options Outstanding, Weighted Average Remaining Contractual Term | 7 years 8 months 12 days |  |
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price | $ 21.28 |  |
Exercise Price Range, Number of Exercisable Options | 435,311 |  |
Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term | 7 years 3 months 18 days |  |
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price | $ 20.89 |  |
$27.00 - $32.99 [Member] |  |  |
Options Outstanding, Range of Exercise Prices [Abstract] |  |  |
Exercise Price Range, Number of Outstanding Options | 1,205,146 |  |
Exercise Price Range, Options Outstanding, Weighted Average Remaining Contractual Term | 4 years 1 month 6 days |  |
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price | $ 29.14 |  |
Exercise Price Range, Number of Exercisable Options | 1,201,652 |  |
Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term | 4 years 1 month 6 days |  |
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price | $ 29.14 |  |
$33.00 - $38.31 [Member] |  |  |
Options Outstanding, Range of Exercise Prices [Abstract] |  |  |
Exercise Price Range, Number of Outstanding Options | 583,504 |  |
Exercise Price Range, Options Outstanding, Weighted Average Remaining Contractual Term | 6 years 1 month 6 days |  |
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price | $ 37.37 |  |
Exercise Price Range, Number of Exercisable Options | 222,996 |  |
Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term | 1 year 2 months 12 days |  |
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price | $ 37.37 |  |
Service Based Restricted Shares and Restricted Stock Units [Member] |  |  |
Restricted Shares and RSUs, Nonvested, Number of Shares [Roll Forward] |  |  |
Restricted Shares and RSUs, Nonvested, Number | 678,381 |  |
Restricted Shares and RSUs, Grants in Period | 96,137 |  |
Restricted Shares and RSUs, Vested in Period | (187,532) |  |
Restricted Shares and RSUs, Forfeited in Period | (69,878) |  |
Restricted Shares and RSUs, Nonvested, Number | 517,108 | 678,381 |
Restricted Shares and RSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |
Restricted Shares and RSUs, Nonvested, Weighted Average Grant Date Fair Value | $ 23.57 |  |
Restricted Shares and RSUs, Grants in Period, Weighted Average Grant Date Fair Value | 35.15 |  |
Restricted Shares and RSUs, Vested in Period, Weighted Average Grant Date Fair Value | 23.56 |  |
Restricted Shares and RSUs, Forfeitures, Weighted Average Grant Date Fair Value | 24.47 |  |
Restricted Shares and RSUs, Nonvested, Weighted Average Grant Date Fair Value | $ 25.61 | $ 23.57 |
Performance Based Restricted Shares and Restricted Stock Units [Member] |  |  |
Restricted Shares and RSUs, Nonvested, Number of Shares [Roll Forward] |  |  |
Restricted Shares and RSUs, Nonvested, Number | 0 |  |
Restricted Shares and RSUs, Grants in Period | 58,206 |  |
Restricted Shares and RSUs, Vested in Period | 0 |  |
Restricted Shares and RSUs, Forfeited in Period | 0 |  |
Restricted Shares and RSUs, Nonvested, Number | 58,206 | 0 |
Restricted Shares and RSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |
Restricted Shares and RSUs, Nonvested, Weighted Average Grant Date Fair Value | $ 0.00 |  |
Restricted Shares and RSUs, Grants in Period, Weighted Average Grant Date Fair Value | 32.03 |  |
Restricted Shares and RSUs, Vested in Period, Weighted Average Grant Date Fair Value | 0.00 |  |
Restricted Shares and RSUs, Forfeitures, Weighted Average Grant Date Fair Value | 0.00 |  |
Restricted Shares and RSUs, Nonvested, Weighted Average Grant Date Fair Value | $ 32.03 | $ 0.00 |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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