Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2016	Jan. 02, 2016
Revenues [Abstract]
Subscription	$ 54,362	$ 22,176
Support	151,478	171,756
Total recurring software revenue	205,840	193,932
Perpetual license	34,379	47,763
Total software revenue	240,219	241,695
Professional services	46,108	49,322
Total revenue	286,327	291,017
Cost of revenue:
Cost of software revenue	42,947	36,814
Cost of professional services revenue	39,168	43,333
Total cost of revenue	82,115	80,147
Gross margin	204,212	210,870
Operating expenses:
Sales and marketing	90,690	82,429
Research and development	57,914	57,669
General and administrative	36,695	38,567
Amortization of acquired intangible assets	8,067	8,350
Restructuring charges	6,285	37,147
Total operating expenses	199,651	224,162
Operating income (loss)	4,561	(13,292)
Interest and other expense, net	(11,064)	(6,253)
Loss before income taxes	(6,503)	(19,545)
Provision for income taxes	2,638	4,347
Net loss	$ (9,141)	$ (23,892)
Earnings(loss) per share—Basic (in USD per share)	$ (0.08)	$ (0.21)
Earnings(loss) per share—Diluted (in USD per share)	$ (0.08)	$ (0.21)
Weighted average shares outstanding—Basic (in shares)	115,290	114,151
Weighted average shares outstanding—Diluted (in shares)	115,290	114,151