Segment and Geographic Information (Details) $ in Thousands	3 Months Ended
Dec. 28, 2019 USD ($) Segment	Dec. 29, 2018 USD ($)
Number of operating segments \| Segment	2
Revenue	$ 356,110	$ 334,689
Operating Costs	87,405	77,352
Gross margin	268,705	257,337
Sales and marketing	107,604	104,218
General and administrative	44,557	37,864
Restructuring charges	13,758	16,586
Restructuring and other charges, net	14,034	18,493
Amortization of acquired intangible assets	6,777	5,936
Total operating income	30,425	30,044
Interest expense	(12,098)	(10,276)
Other income (expense), net	(704)	(655)
Income before income taxes	19,031	20,423
Operating Segments
Revenue	356,110	334,689
Operating Costs	135,939	123,491
Gross margin	220,171	211,198
Operating Segments \| Americas
Revenue	155,973	141,853
Operating Segments \| Europe
Revenue	136,521	111,352
Operating Segments \| Asia-Pacific
Revenue	63,616	81,484
Unallocated
Sales and marketing	100,152	94,496
General and administrative	26,919	25,771
Restructuring charges	14,034	16,586
Restructuring and other charges, net	0	1,907
Amortization of acquired intangible assets	13,576	12,653
Stock-based compensation	27,936	29,407
Other unallocated operating expenses	7,129	334
Software Products \| Operating Segments
Revenue	314,366	293,243
Operating Costs	102,192	91,628
Gross margin	212,174	201,615
Professional Services \| Operating Segments
Revenue	41,744	41,446
Operating Costs	33,747	31,863
Gross margin	$ 7,997	$ 9,583

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