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Shareholders' Equity - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Apr. 01, 2017 | Mar. 31, 2018 | Apr. 01, 2017 | Feb. 14, 2018 | Jun. 06, 2016
2016 Stock Repurchase Program [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Authorized repurchase amount |  |  |  |  |  | $ 150,000,000
Amount repurchased (in shares) | 512,943 | 123,082 | 671,409 | 267,811 |  |
Amount repurchased | $ 31,600,000 | $ 6,800,000 | $ 41,200,000 | $ 13,900,000 |  |
Average repurchase price (in dollars per share) | $ 61.63 | $ 55.61 | $ 61.30 | $ 51.93 |  |
2018 Stock Repurchase Program [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Authorized repurchase amount |  |  |  |  | $ 200,000,000.0 |

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