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Stock-based Compensation (Schedule of Classification of Compensation Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2016 | Jan. 02, 2016
Total stock-based compensation expense | $ 17,988 | $ 23,189
Cost of software revenue |  |
Total stock-based compensation expense | 1,437 | 1,905
Cost of professional service revenue |  |
Total stock-based compensation expense | 1,457 | 1,451
Sales and Marketing |  |
Total stock-based compensation expense | 3,621 | 4,282
Research and Development |  |
Total stock-based compensation expense | 2,997 | 2,513
General and Administrative |  |
Total stock-based compensation expense | 8,476 | 13,038
stock modification [Member] |  |
Total stock-based compensation expense |  | $ 10,000
ESPP [Member] |  |
Total stock-based compensation expense | $ 600 |

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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=56944662&loc=d3e3602-108585 + Details
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