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Share-Based Employee Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jul. 31, 2020 | Sep. 27, 2020 | Sep. 29, 2019 | Sep. 30, 2018
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards outstanding (in shares) |  | 175,141 | 311,845 |
Vesting period |  | 4 years |  |
Total unrecognized compensation cost related to stock options granted |  | $ 2.6 |  |
Weighted-average period for unrecognized compensation cost, (in years) |  | 1 year 4 months 24 days |  |
Weighted-average grant-date fair value of RSUs granted (in usd per share) |  | $ 73.94 | $ 86.08 | $ 94.93
Total fair value of awards vested |  | $ 8.7 | $ 4.7 | $ 4.4
Modified restricted stock units vested in period (in shares) |  | 126,694 |  |
Modified Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Modified restricted stock units vested in period (in shares) | 23,128 |  |  |
Performance Share Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards outstanding (in shares) |  | 25,042 | 75,490 |
Vesting period |  | 3 years |  |
Total unrecognized compensation cost related to stock options granted |  | $ 0.5 |  |
Weighted-average period for unrecognized compensation cost, (in years) |  | 1 year 7 months 6 days |  |
Weighted-average grant-date fair value of RSUs granted (in usd per share) |  | $ 81.02 |  |
Total fair value of awards vested |  | $ 0.5 | $ 2.1 | $ 1.6
Modified restricted stock units vested in period (in shares) |  | 21,509 |  |
Weighted-average grant-date fair value of options granted (in usd per share) |  | $ 81.02 | $ 84.60 | $ 97.02
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Total unrecognized compensation cost related to stock options granted |  | $ 0.3 |  |
Weighted-average period for unrecognized compensation cost, (in years) |  | 2 years |  |
Weighted-average grant-date fair value of options granted (in usd per share) |  | $ 13.97 |  | $ 18.49
Total intrinsic value of stock options exercised |  | $ 0.7 | $ 0.5 | $ 2.3
Nonvested Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Modified restricted stock units vested in period (in shares) |  | 33,243 |  |
Deferred Compensation for Non Management Directors |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards outstanding (in shares) |  | 105,876 | 100,005 |
Minimum | Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock units vested, percentage |  | 50.00% |  |
Minimum | Performance Share Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance share awards vesting rights, percentage |  | 0.00% |  |
Maximum | Performance Share Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance share awards vesting rights, percentage |  | 150.00% |  |
Management | Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards outstanding (in shares) |  | 29,254 |  |
Vesting period |  | 3 years |  |
Non-Management Directors | Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards outstanding (in shares) |  | 64,836 |  |
Vesting period |  | 12 months |  |
Two Thousand Four Stock Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Authorized (in shares) |  | 11,600,000 |  |
Common stock available for future issuance (in shares) |  | 1,764,132 |  |
Deferred Compensation Plan for Non-Management Directors |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Authorized (in shares) |  | 350,000 |  |
Common stock available for future issuance (in shares) |  | 142,918 |  |
Prior to Fiscal 2011 | Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards outstanding (in shares) |  | 34,700 |  |
Since Fiscal 2011 | Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards outstanding (in shares) |  | 46,351 |  |

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- Definition 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 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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