CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Total revenues	$ 1,294,562	$ 1,160,083	$ 1,000,146
Operating expenses:
Cost of revenues	361,142	336,845	312,898
Research and development	166,499	149,478	128,383
Selling, general and administrative	420,930	414,086	376,912
Amortization of intangible assets	4,993	6,126	6,594
Restructuring and impairment charges	45,029	0	0
Total operating expenses	998,593	906,535	824,787
Operating income	295,969	253,548	175,359
Interest expense, net	(42,177)	(39,752)	(31,311)
Other income, net	3,208	2,276	12,884
Income before income taxes	257,000	216,072	156,932
Provision for income taxes	20,589	23,948	30,450
Net income	236,411	192,124	126,482
Other comprehensive income (loss):
Foreign currency translation adjustments	7,090	(13,664)	(9,926)
Comprehensive income	$ 243,501	$ 178,460	$ 116,556
Basic earnings per share (in dollars per share)	$ 8.13	$ 6.63	$ 4.26
Shares used in computing basic earnings per share (in shares)	29,067	28,980	29,711
Diluted earnings per share (in dollars per share)	$ 7.90	$ 6.34	$ 4.06
Shares used in computing diluted earnings per share (in shares)	29,932	30,294	31,180
Transactional and maintenance
Revenues:
Total revenues	$ 973,933	$ 860,948	$ 750,603
Professional services
Revenues:
Total revenues	183,040	184,095	176,910
License
Revenues:
Total revenues	$ 137,589	$ 115,040	$ 72,633