Quarterly Results Of Operations (Unaudited) (Tables)

12 Months Ended

Sep. 30, 2020

Quarterly Financial Data [Abstract]

Schedule Of Quarterly Results Of Operations

	Three Months Ended
	Sept. 30, 2020		June 30, 2020		March 31, 2020		Dec. 31, 2019		Sept. 30, 2019		June 30, 2019		March 31, 2019		Dec. 31, 2018
	(unaudited and in thousands, except per share data)
Net revenues
Products	$	278,451	$	253,331	$	259,538	$	234,536	$	264,926	$	248,929	$	237,859	$	233,877
Services	336,365		329,921		323,911		334,769		325,462		314,465		307,036		309,893
Total	614,816		583,252		583,449		569,305		590,388		563,394		544,895		543,770
Cost of net revenues
Products	62,634		57,437		53,086		42,118		44,693		44,336		43,547		42,410
Services	49,333		48,603		48,152		46,524		46,225		46,431		44,631		44,304
Total	111,967		106,040		101,238		88,642		90,918		90,767		88,178		86,714
Gross profit	502,849		477,212		482,211		480,663		499,470		472,627		456,717		457,056
Operating expenses
Sales and marketing	220,379		211,808		215,472		195,519		217,554		195,852		170,954		164,259
Research and development	120,300		115,991		109,028		96,005		102,812		116,894		96,314		92,038
General and administrative	63,557		61,792		74,013		59,004		64,390		57,141		46,656		42,543
Restructuring charges	—		—		—		7,800		—		—		—		—
Total operating expenses	404,236		389,591		398,513		358,328		384,756		369,887		313,924		298,840
Income from operations	98,613		87,621		83,698		122,335		114,714		102,740		142,793		158,216
Other income, net	(1,090)		141		(141)		5,220		3,397		4,722		7,434		7,095
Income before income taxes	97,523		87,762		83,557		127,555		118,111		107,462		150,227		165,311
Provision for income taxes	19,860		17,890		22,178		29,028		23,274		21,557		34,140		34,406
Net income	$	77,663	$	69,872	$	61,379	$	98,527	$	94,837	$	85,905	$	116,087	$	130,905
Net income per share — basic	$	1.27	$	1.15	$	1.01	$	1.62	$	1.57	$	1.43	$	1.94	$	2.17
Weighted average shares — basic	61,149		60,978		60,869		60,649		60,283		59,981		59,686		60,216
Net income per share — diluted	$	1.26	$	1.14	$	1.00	$	1.62	$	1.57	$	1.43	$	1.93	$	2.16
Weighted average shares — diluted	61,636		61,415		61,084		60,815		60,448		60,196		60,029		60,645