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Stock-based Compensation (Narrative) (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) shares / unit | Apr. 01, 2017 USD ($) | Mar. 31, 2018 USD ($) shares / unit | Apr. 01, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Common Stock Issuable per Restricted Stock Unit | shares / unit | 1 |  | 1 |
ESPP maximum contribution percentage | 10.00% |  | 10.00% |
ESPP maximum contribution amount by employee |  |  | $ 25,000 |
ESPP purchase price as a % of stock price | 85.00% |  | 85.00% |
Stock-based compensation | $ 17,026,000 | $ 21,577,000 | $ 35,357,000 | $ 39,565,000
ESPP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation | $ 1,000,000 | $ 700,000 | $ 2,100,000 | $ 1,300,000

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- Definition ESPP maximum contribution percentage + References No definition available. + Details
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- Definition ESPP purchase price as a % of stock price + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Common Stock Issuable per Restricted Stock Unit + References No definition available. + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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