Summary of Changes in RSUs Granted Under Equity Incentive Plan (Detail) - Restricted Stock Units - $ / shares	11 Months Ended	12 Months Ended
Oct. 02, 2015	Sep. 29, 2017	Sep. 30, 2016
Non-vested shares
Non-vested, beginning of year	103,971	99,778	117,281
Granted	28,150	37,100	37,000
Vested	(12,740)	(44,420)	(48,053)
Forfeited/cancelled	(2,100)	(7,200)	(6,450)
Non-vested, end of year	117,281	85,258	99,778
Weighted-Average Grant Date Fair Value per Share
Weighted-Average grant date fair value per share Non-vested, beginning of year	$ 80.01	$ 90.04	$ 85.95
Weighted-Average grant date fair value per share Granted	105.34	76.83	84.70
Weighted-Average grant date fair value per share Vested	79.84	85.77	75.35
Weighted-Average grant date fair value per share Forfeited/cancelled	88.99	91.71	94.58
Weighted-Average grant date fair value per share Non-vested, end of year	$ 85.95	$ 86.37	$ 90.04

No definition available.

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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
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-Subparagraph (c)(1)(iv)(3)
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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
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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

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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

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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

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-Publisher FASB
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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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.

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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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-Name Accounting Standards Codification
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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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