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Stock-based Compensation (Schedule of Classification of Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Mar. 31, 2018	Apr. 01, 2017
Total stock-based compensation expense	$ 17,026	$ 21,577	$ 35,357	$ 39,565
Cost of license and subscription revenue
Total stock-based compensation expense	408	314	821	607
Cost of support revenue
Total stock-based compensation expense	690	1,355	1,498	2,499
Cost of professional services revenue
Total stock-based compensation expense	1,669	1,539	3,375	2,995
Sales and marketing
Total stock-based compensation expense	5,038	4,130	9,917	7,751
Research and development
Total stock-based compensation expense	3,383	3,951	6,343	6,948
General and administrative
Total stock-based compensation expense	$ 5,838	$ 10,288	$ 13,403	$ 18,765

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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

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