Segment and Geographic Information - Summary of Revenue and Profit Attributable to Our Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Segment Reporting Revenue Reconciling Item [Line Items]
Revenue	$ 351,721	$ 295,486	$ 1,067,434	$ 920,626
Operating Costs	79,224	82,705	249,656	239,961
Gross margin	272,497	212,781	817,778	680,665
Sales and marketing	104,594	108,202	319,636	316,142
General and administrative	35,709	28,773	113,895	102,008
Restructuring and other charges, net	62	(9)	32,338	45,464
Intangibles amortization	14,159	12,793	41,902	38,218
Total operating income	63,401	9,305	143,851	16,491
Interest and debt premium expense	(19,660)	(10,816)	(64,376)	(32,475)
Other income (expense), net	775	1,026	(150)	2,501
Income (loss) before income taxes	44,516	(485)	79,325	(13,483)
Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Revenue	351,721	295,486	1,067,434	920,626
Operating Costs	125,048	129,155	389,324	378,885
Gross margin	226,673	166,331	678,110	541,741
Unallocated
Segment Reporting Revenue Reconciling Item [Line Items]
Sales and marketing	95,187	102,332	295,631	291,028
General and administrative	28,005	26,310	82,719	77,937
Restructuring and other charges, net	62	(9)	32,338	45,464
Intangibles amortization	14,159	12,793	41,902	38,218
Stock-based compensation	25,185	15,234	73,605	71,608
Other unallocated operating expenses	674	366	8,064	995
Software Products \| Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Revenue	317,394	253,405	955,840	796,169
Operating Costs	95,198	94,829	292,302	280,370
Gross margin	222,196	158,576	663,538	515,799
Professional Services \| Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Revenue	34,327	42,081	111,594	124,457
Operating Costs	29,850	34,326	97,022	98,515
Gross margin	$ 4,477	$ 7,755	$ 14,572	$ 25,942

Amortization of intangible assets including cost of goods and services sold amortization.

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Unallocated operating expenses.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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The aggregate total amount of expenses directly related to the marketing or selling of products or services.

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