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Employee Stock Purchase and Stock Option Plans (Information Regarding Options Outstanding, and Options Exercisable) (Details) - $ / shares	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017	Sep. 30, 2016
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options Outstanding, Number (in shares)	926,606	1,766,759	2,516,825	3,577,512
Options Outstanding, Weighted Average Remaining Contractual Life (years)	4 years 3 months 14 days
Options Outstanding, Weighted Average Price (in dollars per share)	$ 45.48	$ 45.53	$ 46.19	$ 45.69
Options Exercisable, Number (in shares)	860,114
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 45.75
$32.51 - $37.03
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options Outstanding, Number (in shares)	60,500
Options Outstanding, Weighted Average Remaining Contractual Life (years)	2 years 7 months 24 days
Options Outstanding, Weighted Average Price (in dollars per share)	$ 36.99
Options Exercisable, Number (in shares)	60,500
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 36.99
$37.43 - $46.09
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options Outstanding, Number (in shares)	607,119
Options Outstanding, Weighted Average Remaining Contractual Life (years)	4 years 9 months 3 days
Options Outstanding, Weighted Average Price (in dollars per share)	$ 42.90
Options Exercisable, Number (in shares)	540,627
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 43.02
$47.11 - $55.13
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options Outstanding, Number (in shares)	227,612
Options Outstanding, Weighted Average Remaining Contractual Life (years)	3 years 5 months 15 days
Options Outstanding, Weighted Average Price (in dollars per share)	$ 52.54
Options Exercisable, Number (in shares)	227,612
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 52.54
$60.08 - $80.63
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options Outstanding, Number (in shares)	31,375
Options Outstanding, Weighted Average Remaining Contractual Life (years)	4 years 3 months 21 days
Options Outstanding, Weighted Average Price (in dollars per share)	$ 60.36
Options Exercisable, Number (in shares)	31,375
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 60.36

X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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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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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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