Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
Revenues [Abstract]
Subscription	$ 31,822	$ 17,155	$ 77,657	$ 47,143
Support	161,881	165,687	494,262	516,042
Total recurring software revenue	193,703	182,842	571,919	563,185
Perpetual license	44,648	66,771	132,100	201,707
Total software revenue	238,351	249,613	704,019	764,892
Professional services	50,301	53,500	148,277	177,782
Total revenue	288,652	303,113	852,296	942,674
Cost of revenue:
Cost of software revenue	38,864	33,282	114,291	102,525
Cost of professional services revenue	43,606	46,094	128,518	155,847
Total cost of revenue	82,470	79,376	242,809	258,372
Gross margin	206,182	223,737	609,487	684,302
Operating expenses:
Sales and marketing	94,874	88,353	264,480	261,702
Research and development	57,118	54,078	171,397	175,333
General and administrative	35,485	46,201	107,968	113,725
Amortization of acquired intangible assets	8,294	9,105	25,040	27,691
Restructuring charges	2,815	4,393	44,541	42,625
Total operating expenses	198,586	202,130	613,426	621,076
Operating income (loss)	7,596	21,607	(3,939)	63,226
Interest and other expense, net	(8,300)	(3,668)	(19,880)	(10,492)
Income (loss) before income taxes	(704)	17,939	(23,819)	52,734
Provision (benefit) for income taxes	(3,777)	504	2,173	(377)
Net income (loss)	$ 3,073	$ 17,435	$ (25,992)	$ 53,111
Earnings(loss) per share—Basic (in USD per share)	$ 0.03	$ 0.15	$ (0.23)	$ 0.46
Earnings(loss) per share—Diluted (in USD per share)	$ 0.03	$ 0.15	$ (0.23)	$ 0.46
Weighted average shares outstanding—Basic (in shares)	114,795	114,764	114,499	115,021
Weighted average shares outstanding—Diluted (in shares)	115,698	116,025	114,499	116,330