Consolidated Income Statements - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Net revenues
Products	$ 241,080	$ 225,441	$ 480,563	$ 460,119
Services	277,168	258,236	553,643	513,044
Total	518,248	483,677	1,034,206	973,163
Cost of net revenues
Products	43,928	39,908	85,604	82,559
Services	43,984	42,322	87,570	85,354
Total	87,912	82,230	173,174	167,913
Gross profit	430,336	401,447	861,032	805,250
Operating expenses
Sales and marketing	164,705	156,469	329,219	313,925
Research and development	89,234	86,294	176,284	167,439
General and administrative	38,009	34,803	79,687	69,056
Litigation Expense	(135)	8,948	(135)	8,948
Total	291,813	286,514	585,055	559,368
Income from operations	138,523	114,933	275,977	245,882
Other income, net	1,302	133	3,945	1,268
Income before income taxes	139,825	115,066	279,922	247,150
Provision for income taxes	46,687	39,651	92,566	82,019
Net income	$ 93,138	$ 75,415	$ 187,356	$ 165,131
Net income per share — basic (dollars per share)	$ 1.44	$ 1.12	$ 2.89	$ 2.41
Weighted average shares — basic (shares)	64,479	67,549	64,841	68,557
Net income per share — diluted (dollars per share)	$ 1.43	$ 1.11	$ 2.87	$ 2.40
Weighted average shares — diluted (shares)	65,028	67,804	65,389	68,881