Segment and Geographic Information (Details) $ in Thousands	3 Months Ended	9 Months Ended
Jun. 29, 2019 USD ($) Segment	Jun. 30, 2018 USD ($)	Jun. 29, 2019 USD ($) Segment	Jun. 30, 2018 USD ($)
Number of operating segments \| Segment			2
Number of reportable segments \| Segment	2
Revenue	$ 295,486	$ 314,777	$ 920,626	$ 929,303
Operating Costs	82,705	81,633	239,961	248,376
Gross margin	212,781	233,144	680,665	680,927
Sales and marketing	108,202	107,801	316,142	305,566
General and administrative	28,773	33,098	102,008	101,487
Restructuring and other charges, net	(9)	1,627	45,464	1,846
Amortization of acquired intangible assets	5,920	7,850	17,786	23,566
Operating income	9,305	21,547	16,491	61,072
Interest expense	(10,816)	(10,646)	(32,475)	(31,072)
Other income (expense), net	(1,026)	930	(2,501)	2,013
Income (loss) before income taxes	(485)	9,971	(13,483)	27,987
Operating Segments
Revenue	295,486	314,777	920,626	929,303
Operating Costs	129,155	130,447	378,885	398,291
Gross margin	166,331	184,330	541,741	531,012
Operating Segments \| Americas [Member]
Revenue	122,867	133,439	384,437	388,923
Operating Segments \| Europe [Member]
Revenue	112,083	119,876	342,477	362,982
Operating Segments \| Asia Pacific [Member]
Revenue	60,536	61,462	193,712	177,398
Unallocated
Sales and marketing	102,332	102,891	291,028	290,739
General and administrative	26,310	25,474	77,937	80,320
Restructuring and other charges, net	(9)	1,627	45,464	1,846
Amortization of acquired intangible assets	12,793	14,648	38,218	43,595
Stock-based compensation	15,234	16,658	71,608	52,015
Other unallocated operating expenses	366	1,485	995	1,425
Restructuring Plan 2019 [Member]
Restructuring and other charges, net			16,000
Solutions \| Operating Segments
Revenue	254,735	279,091	805,146	831,754
IoT \| Operating Segments
Revenue	40,751	35,686	115,480	97,549
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue	322,410	314,777	976,666	929,303
Operating Costs	81,233		234,396
Gross margin	241,177		742,270
Sales and marketing	113,533		330,258
General and administrative	28,773		102,008
Restructuring and other charges, net	(9)		45,464
Amortization of acquired intangible assets	5,920		17,786
Operating income	32,370		63,980
Interest expense	(10,816)		(32,475)
Other income (expense), net	(736)		(2,349)
Income (loss) before income taxes	22,290		33,854
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Operating Segments
Revenue	322,410		976,666
Operating Costs	127,683		373,320
Gross margin	194,727		603,346
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Operating Segments \| Americas [Member]
Revenue	144,389		417,061
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Operating Segments \| Europe [Member]
Revenue	122,988		366,392
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Operating Segments \| Asia Pacific [Member]
Revenue	55,033		193,213
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Unallocated
Sales and marketing	107,663		305,144
General and administrative	26,310		77,937
Restructuring and other charges, net	(9)		45,464
Amortization of acquired intangible assets	12,793		38,218
Stock-based compensation	15,234		71,608
Other unallocated operating expenses	366		995
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Solutions \| Operating Segments
Revenue	278,581		849,679
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| IoT \| Operating Segments
Revenue	43,829		126,987
Software Products \| Operating Segments
Revenue	253,405	273,619	796,169	801,262
Operating Costs	94,829	96,465	280,370	293,546
Gross margin	158,576	177,154	515,799	507,716
Software Products \| Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Operating Segments
Revenue	281,939		858,228
Operating Costs	94,341		278,572
Gross margin	187,598		579,656
Professional Services \| Operating Segments
Revenue	42,081	41,158	124,457	128,041
Operating Costs	34,326	33,982	98,515	104,745
Gross margin	7,755	$ 7,176	25,942	$ 23,296
Professional Services \| Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Operating Segments
Revenue	40,471		118,438
Operating Costs	33,342		94,748
Gross margin	$ 7,129		$ 23,690

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