Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Revenue:
Revenue	$ 359,603	$ 290,451	$ 715,713	$ 625,140
Cost of revenue:
Cost of revenue	83,027	79,904	170,432	157,256
Gross margin	276,576	210,547	545,281	467,884
Operating expenses:
Sales and marketing	107,438	103,722	215,042	207,940
Research and development	59,954	61,402	125,262	122,184
General and administrative	33,629	35,371	78,186	73,235
Amortization of acquired intangible assets	7,288	5,930	14,065	11,866
Restructuring and other charges, net	18,242	26,980	32,276	45,473
Total operating expenses	226,551	233,405	464,831	460,698
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)
Provision (benefit) for income taxes	8,622	10,093	(7,802)	9,530
Net income (loss)	$ 7,156	$ (43,513)	$ 42,611	$ (22,528)
Earnings per share—Basic (in USD per share)	$ 0.06	$ (0.37)	$ 0.37	$ (0.19)
Earnings per share—Diluted (in USD per share)	$ 0.06	$ (0.37)	$ 0.37	$ (0.19)
Weighted-average shares outstanding—Basic	115,606	118,461	115,401	118,392
Weighted-average shares outstanding—Diluted	116,017	118,461	115,856	118,392
Software
Revenue:
Revenue	$ 324,080	$ 249,521	$ 638,446	$ 542,764
Cost of revenue:
Cost of revenue	48,137	45,749	100,238	89,509
License
Revenue:
Revenue	127,607	61,876	251,037	167,198
Cost of revenue:
Cost of revenue	13,873	12,875	27,046	25,438
Support and cloud services
Revenue:
Revenue	196,473	187,645	387,409	375,566
Cost of revenue:
Cost of revenue	34,264	32,874	73,192	64,071
Professional services
Revenue:
Revenue	35,523	40,930	77,267	82,376
Cost of revenue:
Cost of revenue	$ 34,890	$ 34,155	$ 70,194	$ 67,747