Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Revenues [Abstract]
Subscription	$ 74,859	$ 31,822	$ 195,001	$ 77,657
Support	140,428	161,881	433,624	494,262
Total recurring revenue	215,287	193,703	628,625	571,919
Perpetual license	32,348	44,648	94,099	132,100
Total subscription, support and license revenue	247,635	238,351	722,724	704,019
Professional services	43,658	50,301	134,936	148,277
Total revenue	291,293	288,652	857,660	852,296
Cost of revenue:
Cost of license and subscription revenue	21,648	17,809	62,333	50,621
Cost of support revenue	23,635	21,055	69,028	63,670
Total cost of software revenue	45,283	38,864	131,361	114,291
Cost of professional services revenue	36,985	43,606	114,852	128,518
Total cost of revenue	82,268	82,470	246,213	242,809
Gross margin	209,025	206,182	611,447	609,487
Operating expenses:
Sales and marketing	93,101	94,874	271,568	264,480
Research and development	59,850	57,118	175,474	171,397
General and administrative	35,294	35,485	108,789	107,968
Amortization of acquired intangible assets	7,973	8,294	23,986	25,040
Restructuring charges	1,551	2,815	8,300	44,541
Total operating expenses	197,769	198,586	588,117	613,426
Operating income (loss)	11,256	7,596	23,330	(3,939)
Interest expense	(10,200)	(8,164)	(32,239)	(19,511)
Interest income and other expense, net	(357)	(136)	2,049	(369)
Income (loss) before income taxes	699	(704)	(6,860)	(23,819)
Provision (benefit) for income taxes	1,650	(3,777)	4,336	2,173
Net income (loss)	$ (951)	$ 3,073	$ (11,196)	$ (25,992)
Earnings(loss) per share—Basic (in USD per share)	$ (0.01)	$ 0.03	$ (0.10)	$ (0.23)
Earnings(loss) per share—Diluted (in USD per share)	$ (0.01)	$ 0.03	$ (0.10)	$ (0.23)
Weighted average shares outstanding—Basic (in shares)	115,615	114,795	115,511	114,499
Weighted average shares outstanding—Diluted (in shares)	115,615	115,698	115,511	114,499