Employee Stock Plans - Additional Information (Detail) (USD $)	12 Months Ended
Oct. 31, 2014	Oct. 25, 2013	Oct. 26, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 13,044,000us-gaap_ShareBasedCompensation	$ 9,575,000us-gaap_ShareBasedCompensation	$ 9,543,000us-gaap_ShareBasedCompensation
Income tax benefit recognized	3,000,000	3,000,000	2,900,000
Number of options granted	207,200	257,000	386,400
Number of options exercised	618,645	518,537	60,775
Weighted average exercise price of options exercised	$ 45.16	$ 37.89	$ 36.52
Aggregate intrinsic value of option shares outstanding	78,200,000
Aggregate intrinsic value of option shares exercisable	50,400,000
Number of option shares vested or expected to vest	1,300,000
Option shares vested or expected to vest aggregate intrinsic value	75,300,000
Weighted average exercise price of option shares vested or expected to vest	$ 59.67
Weighted average remaining contractual term of option shares vested or expected to vest, years	6 years 1 month 6 days
Weighted average remaining contractual term of option shares currently exercisable	4 years 10 months 24 days
Total unrecognized compensation expense for options	7,400,000
Unrecognized compensation expense will be recognized over a weighted average period, years	1 year 10 months 24 days
Fair value of option shares vested	8,200,000esl_FairValueOfOptionSharesVested
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation expense for options	4,300,000
Unrecognized compensation expense will be recognized over a weighted average period, years	1 year 8 months 12 days
Granted	77,975	55,280
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase price fair market value percentage	95.00%
Number of shares purchased by employees	19,807
Employees purchase price per share fair market value	$ 102.45
Employee Share-save Scheme
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance, shares	93,406
Remaining shares available for issuance	593,436
Accrued deductions for purchase of shares	$ 759,440
Share purchase date	December 15, 2014
Discount rate of market value on purchase date	95.00%
The term of options, years	3 years
Number of options granted	29,242	16,722	45,063
Weighted-average grant date fair value of options granted	$ 27.03
Number of options exercised	7,923
Weighted average exercise price of options exercised	$ 66.05
Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Remaining shares available for issuance	1,480,764
Weighted-average grant date fair value of options granted	$ 45.87	$ 29.65
Shares reserved for issuance to officers and key employees	1,456,261
Award period	10 years
Award period end date	Mar. 05, 2023
Options vesting period	4 years

Accrued deductions for purchase of shares.

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Employee purchase price per share fair market value.

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Fair value of option shares vested.

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Number of shares purchased by employees.

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Outstanding and available for Issuance.

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Plan expiration date.

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Share purchase date.

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Shares reserved for issuance under share save scheme.

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The Term Of Options.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Discount rate from fair value on purchase date that participants pay for shares.

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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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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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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 the reported fact of one year, five months, and thirteen days.

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Purchase price of common stock expressed as a percentage of its fair value.

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

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

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

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