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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Jul. 31, 2017
Accounting Policies [Abstract] |
Schedule of foreign currency translation | The cumulative effects of foreign currency exchange rate fluctuations were as follows (in thousands):
Cumulative loss on foreign currency translation as of July 31, 2015 |  | $ | (68,510 | )
Loss on foreign currency translation |  | (40,684 | )
Cumulative loss on foreign currency translation as of July 31, 2016 |  | $ | (109,194 | )
Gain on foreign currency translation |  | 8,518 |
Cumulative loss on foreign currency translation as of July 31, 2017 |  | $ | (100,676 | )
Schedule of fair value assumptions | The fair value of each option was estimated on the measurement date using the Black-Scholes Merton (BSM) option-pricing model utilizing the following assumptions:
|  | July 31,
|  | 2017 |  | 2016 |  | 2015
Expected life (in years) |  | 5.5 – 7.4 |  |  | 5.3 – 7.2 |  |  | 5.3 – 7.2 |
Risk-free interest rate |  | 1.20 – 2.07 |  |  | 1.16 – 2.06 |  |  | 1.58 – 2.26 |
Estimated volatility |  | 20 – 23 |  |  | 21 – 26 |  |  | 22 – 28 |
Expected dividends |  | — | % |  | — | % |  | — | %
Weighted average fair value at measurement date |  | $ | 7.05 |  |  | $ | 5.04 |  |  | $ | 5.09 |

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- Definition Tabular disclosure of foreign currency exchange rate fluctuations. + References No definition available. + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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