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Shareholders' Equity - Narrative (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Oct. 01, 2016 | Feb. 14, 2018 | Jun. 06, 2016 | Aug. 20, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Authorized repurchase amount |  |  |  |  |  | $ 30,000,000.0
Amount repurchased (in shares) |  |  | 760,903 |  |  |
Amount repurchased | $ 137,034,000 | $ 34,136,000 | $ 30,000,000 |  |  |
Average repurchase price (in dollars per share) |  |  | $ 39.43 |  |  |
2018 Stock Repurchase Program [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Authorized repurchase amount |  |  |  | $ 200,000,000.0 |  |
Amount repurchased (in shares) | 343,642 |  |  |  |  |
Amount repurchased | $ 21,200,000 |  |  |  |  |
Average repurchase price (in dollars per share) | $ 61.61 |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 178,800,000 |  |  |  |  |
2016 Stock Repurchase Program |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Authorized repurchase amount |  |  |  |  | $ 150,000,000 |
Amount repurchased (in shares) | 1,914,596 | 655,470 |  |  |  |
Amount repurchased | $ 115,900,000 | $ 34,100,000 |  |  |  |
Average repurchase price (in dollars per share) | $ 60.52 | $ 52.08 |  |  |  |

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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