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Stockholder's Investments - Summary of Activity under Company's Share-Based Compensation Plans (Detail) - $ / shares | 12 Months Ended
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Jul. 31, 2015 | Jul. 31, 2014 | Jul. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options Outstanding, Beginning Balance, Price Lower Range | $ 17.23 |  |
Options Outstanding, Beginning Balance, Price Upper Range | 40.37 |  |
Options Granted, Price Lower Range | 22.66 |  |
Options Granted, Price Upper Range | 27.28 |  |
Options Exercised, Price Lower Range | 17.23 |  |
Options Exercised, Price Upper Range | 27.00 |  |
Options Cancelled, Price Lower Range | 22.63 |  |
Options Cancelled, Price Upper Range | 40.37 |  |
Options Outstanding, Ending Balance, Price Lower Range | 20.95 | $ 17.23 |
Options Outstanding, Ending Balance, Price Upper Range | $ 38.31 | $ 40.37 |
Options, Outstanding [Roll Forward] |  |  |
Shares Outstanding, Beginning Balance | 4,204,260 |  |
Options Granted | 628,340 |  |
Options Exercised | (68,533) |  |
Options Cancelled | (1,263,116) |  |
Shares Outstanding, Ending Balance | 3,500,951 | 4,204,260 |
Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |
Options Outstanding, Beginning Balance, Weighted Average Exercise Price | $ 30.82 |  |
Options Granted, Weighted Average Exercise Price | 22.76 | $ 30.98 | $ 30.58
Options Exercised, Weighted Average Exercise Price | 23.73 |  |
Options Cancelled, Weighted Average Exercise Price | 30.48 |  |
Options Outstanding, Ending Balance, Weighted Average Exercise Price | $ 29.64 | $ 30.82 |
Options Outstanding, Range of Exercise Prices [Abstract] |  |  |
Exercise Price Range, Number of Outstanding Options | 3,500,951 |  |
Exercise Price Range, Options Outstanding, Weighted Average Remaining Contractual Term | 5 years 3 months 18 days |  |
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price | $ 29.64 |  |
Exercise Price Range, Number of Exercisable Options | 2,642,955 |  |
Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term | 4 years 3 months 18 days |  |
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price | $ 30.88 |  |
$20.95 - $26.99 [Member] |  |  |
Options Outstanding, Range of Exercise Prices [Abstract] |  |  |
Exercise Price Range, Number of Outstanding Options | 711,527 |  |
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 | $ 22.27 |  |
Exercise Price Range, Number of Exercisable Options | 180,667 |  |
Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term | 3 years 4 months 24 days |  |
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price | $ 20.95 |  |
$27.00 - $32.99 [Member] |  |  |
Options Outstanding, Range of Exercise Prices [Abstract] |  |  |
Exercise Price Range, Number of Outstanding Options | 1,976,924 |  |
Exercise Price Range, Options Outstanding, Weighted Average Remaining Contractual Term | 5 years 9 months 18 days |  |
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price | $ 29.12 |  |
Exercise Price Range, Number of Exercisable Options | 1,667,452 |  |
Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term | 5 years 6 months |  |
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price | $ 28.86 |  |
$33.00 - $38.31 [Member] |  |  |
Options Outstanding, Range of Exercise Prices [Abstract] |  |  |
Exercise Price Range, Number of Outstanding Options | 812,500 |  |
Exercise Price Range, Options Outstanding, Weighted Average Remaining Contractual Term | 2 years |  |
Exercise Price Range, Outstanding Options, Weighted Average Exercise Price | $ 37.34 |  |
Exercise Price Range, Number of Exercisable Options | 794,836 |  |
Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term | 1 year 9 months 18 days |  |
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price | $ 37.39 |  |
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 | 104,857 |  |
Restricted Shares and RSUs, Grants in Period | 661,412 |  |
Restricted Shares and RSUs, Vested in Period | (34,247) |  |
Restricted Shares and RSUs, Forfeited in Period | (54,568) |  |
Restricted Shares and RSUs, Nonvested, Number | 677,454 | 104,857 |
Restricted Shares and RSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |
Restricted Shares and RSUs, Nonvested, Weighted Average Grant Date Fair Value | $ 31.02 |  |
Restricted Shares and RSUs, Grants in Period, Weighted Average Grant Date Fair Value | 24.28 | $ 30.93 | 32.99
Restricted Shares and RSUs, Vested in Period, Weighted Average Grant Date Fair Value | 30.79 |  |
Restricted Shares and RSUs, Forfeitures, Weighted Average Grant Date Fair Value | 27.64 |  |
Restricted Shares and RSUs, Nonvested, Weighted Average Grant Date Fair Value | $ 24.72 | $ 31.02 |
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 | 80,000 |  |
Restricted Shares and RSUs, Grants in Period | 0 |  |
Restricted Shares and RSUs, Vested in Period | 0 |  |
Restricted Shares and RSUs, Forfeited in Period | (80,000) |  |
Restricted Shares and RSUs, Nonvested, Number | 0 | 80,000 |
Restricted Shares and RSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |
Restricted Shares and RSUs, Nonvested, Weighted Average Grant Date Fair Value | $ 32.50 |  |
Restricted Shares and RSUs, Grants in Period, Weighted Average Grant Date Fair Value | 0.00 |  | $ 30.21
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 | 32.50 |  |
Restricted Shares and RSUs, Nonvested, Weighted Average Grant Date Fair Value | $ 0.00 | $ 32.50 |

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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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