Segment Information (Details) $ in Thousands	3 Months Ended	12 Months Ended
Dec. 29, 2018 USD ($) Segment	Dec. 30, 2017 USD ($)	Sep. 30, 2017 Segment
Number of operating segments \| Segment	2
Number of reportable segments \| Segment	2		3
Revenue	$ 334,689	$ 306,644
Operating Costs	77,352	83,035
Gross margin	257,337	223,609
Sales and marketing	104,218	99,375
General and administrative	37,864	35,020
Restructuring and other charges, net	18,493	105
Amortization of acquired intangible assets	5,936	7,821
Operating income	30,044	17,316
Interest expense	(10,276)	(10,047)
Other income (expense), net	(655)	798
Income before income taxes	20,423	6,471
Operating Segments
Revenue	334,689	306,644
Operating Costs	123,491	134,549
Gross margin	211,198	172,095
Operating Segments \| Americas [Member]
Revenue	141,853	127,007
Operating Segments \| Europe [Member]
Revenue	111,352	121,466
Operating Segments \| Asia Pacific [Member]
Revenue	81,484	58,171
Unallocated
Sales and marketing	94,496	94,496
General and administrative	25,771	27,448
Amortization of acquired intangible assets	12,653	14,496
Stock-based compensation	29,407	18,331
Other unallocated operating expenses	334	(97)
Restructuring Plan 2019 [Member]
Restructuring and other charges, net	16,300
Restructuring Plan 2019 [Member] \| Unallocated
Restructuring and other charges, net	16,586	105
Prior Headquarters [Member] \| Unallocated
Restructuring and other charges, net	1,907	0
Solutions \| Operating Segments
Revenue	299,434	277,669
IoT \| Operating Segments
Revenue	35,255	28,975
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue	338,757	306,644
Operating Costs	75,196
Gross margin	263,561
Sales and marketing	107,304
General and administrative	37,864
Restructuring and other charges, net	18,493
Amortization of acquired intangible assets	5,936
Operating income	33,182
Interest expense	(10,276)
Other income (expense), net	(548)
Income before income taxes	23,454
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Operating Segments
Revenue	338,757
Operating Costs	121,335
Gross margin	217,422
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Operating Segments \| Americas [Member]
Revenue	134,897
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Operating Segments \| Europe [Member]
Revenue	120,157
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Operating Segments \| Asia Pacific [Member]
Revenue	83,703
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Unallocated
Sales and marketing	97,583
General and administrative	25,770
Amortization of acquired intangible assets	12,653
Stock-based compensation	29,407
Other unallocated operating expenses	334
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Restructuring Plan 2019 [Member] \| Unallocated
Restructuring and other charges, net	16,586
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Prior Headquarters [Member] \| Unallocated
Restructuring and other charges, net	1,907
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Solutions \| Operating Segments
Revenue	298,351
Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| IoT \| Operating Segments
Revenue	40,406
Software Products \| Operating Segments
Revenue	293,243	265,190
Operating Costs	91,628	99,732
Gross margin	201,615	165,458
Software Products \| Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Operating Segments
Revenue	299,388
Operating Costs	90,845
Gross margin	208,543
Professional Services \| Operating Segments
Revenue	41,446	41,454
Operating Costs	31,863	34,817
Gross margin	9,583	$ 6,637
Professional Services \| Calculated under Revenue Guidance in Effect before Topic 606 [Member] \| Operating Segments
Revenue	39,369
Operating Costs	30,490
Gross margin	$ 8,879

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