Segment and Geographic Information (Details) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 28, 2020 USD ($)	Mar. 30, 2019 USD ($)	Mar. 28, 2020 USD ($) Segment	Mar. 30, 2019 USD ($)
Number of operating segments \| Segment			2
Revenue	$ 359,603	$ 290,451	$ 715,713	$ 625,140
Operating Costs	83,027	79,904	170,432	157,256
Gross margin	276,576	210,547	545,281	467,884
Sales and marketing	107,438	103,722	215,042	207,940
General and administrative	33,629	35,371	78,186	73,235
Restructuring charges	13,200	26,400	26,996	42,971
Restructuring and other charges, net	18,242	26,980	32,276	45,473
Amortization of acquired intangible assets	7,288	5,930	14,065	11,866
Total operating income (loss)	50,025	(22,858)	80,450	7,186
Interest and debt premium expense	(32,618)	(11,383)	(44,716)	(21,659)
Other income (expense), net	1,629	(821)	925	(1,475)
Income (loss) before income taxes	15,778	(33,420)	34,809	(12,998)
Operating Segments
Revenue	359,603	290,451	715,713	625,140
Operating Costs	128,337	126,239	264,276	249,730
Gross margin	231,266	164,212	451,437	375,410
Operating Segments \| Americas
Revenue	153,993	119,717	309,967	261,570
Operating Segments \| Europe
Revenue	146,422	119,045	282,943	230,397
Operating Segments \| Asia-Pacific
Revenue	59,188	51,689	122,803	133,173
Unallocated
Sales and marketing	100,292	94,200	200,444	188,696
General and administrative	27,795	25,856	54,714	51,627
Restructuring and other charges, net	18,242	26,980	32,276	45,473
Amortization of acquired intangible assets	14,167	12,772	27,743	25,425
Stock-based compensation	20,484	26,967	48,420	56,374
Other unallocated operating expenses	261	295	7,390	629
Software Products \| Operating Segments
Revenue	324,080	249,521	638,446	542,764
Operating Costs	94,912	93,913	197,104	185,541
Gross margin	229,168	155,608	441,342	357,223
Professional Services \| Operating Segments
Revenue	35,523	40,930	77,267	82,376
Operating Costs	33,425	32,326	67,172	64,189
Gross margin	$ 2,098	$ 8,604	$ 10,095	$ 18,187

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