Stock-Based Compensation Expense and Shareholders' Equity (Details 2) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Oct. 31, 2019	Jul. 31, 2019
Number of Stock Options Outstanding
Balance at beginning of period (in shares)	216,727
Granted (in shares)	0
Exercised (in shares)	(21,698)
Canceled (in shares)	(257)
Balance at end of period (in shares)	194,772	216,727
Vested and expected to vest as of October 31, 2019 (in shares)	194,772
Exercisable as of October 31, 2019 (in shares)	166,414
Weighted Average Exercise Price
Balance at beginning of period (in dollars per share)	$ 34.10
Exercised (in dollars per share)	16.99
Balance at end of period (in dollars per share)	36.04	$ 34.10
Vested and expected to vest as of October 31, 2019 (in dollars per share)	36.04
Exercisable as of October 31, 2019 (in dollars per share)	$ 40.30
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Life	5 years 1 month 6 days	5 years 2 months 12 days
Vested and expected to vest as of October 31, 2019	5 years 1 month 6 days
Exercisable as of October 31, 2019	4 years 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Aggregate Intrinsic Value [Abstract]
Aggregate intrinsic value	$ 14,939	$ 14,733
Exercised	1,873
Vested and expected to vest as of October 31, 2019	14,939
Exercisable as of October 31, 2019	$ 12,055
Share price (in dollars per share)	$ 112.74	$ 102.08
Restricted Stock Units (RSUs)
Number of Stock Awards Outstanding
Balance at beginning of period (in shares)	2,384,673
Granted (in shares)	1,119,035
Released (in shares)	(440,693)
Canceled (in shares)	(196,791)
Balance at end of period (in shares)	2,866,224	2,384,673
Expected to vest as of October 31, 2019 (in shares)	2,866,224
Weighted Average Grant Date Fair Value
Balance at beginning of period (in dollars per share)	$ 85.20
Granted (in dollars per share)	109.46
Released (in dollars per share)	76.39
Canceled (in dollars per share)	82.05
Balance at end of period (in dollars per share)	95.60	$ 85.20
Expected to vest as of October 31, 2019 (in dollars per share)	$ 95.60
Aggregate intrinsic value, Nonvested	$ 323,138	$ 243,427
Aggregate intrinsic value, Vested	49,684
Aggregate intrinsic value, Expected to vest	$ 323,138

Share-based Compensation Arrangement by Share-based Payment Award, Aggregate Intrinsic Value [Abstract]

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Expected to Vest

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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).

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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.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Price of a single share of a number of saleable stocks of a company.

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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of share options (or share units) exercised during the current period.

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