CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Revenues	$ 307,971	$ 278,234	$ 606,475	$ 540,490
Operating expenses:
Cost of revenues	88,139	85,568	178,897	161,634
Research and development	39,439	37,684	78,382	73,110
Selling, general and administrative	103,465	104,930	215,486	205,188
Amortization of intangible assets	1,202	1,503	2,998	3,005
Restructuring and acquisition-related	0	0	3,104	0
Total operating expenses	232,245	229,685	478,867	442,937
Operating income	75,726	48,549	127,608	97,553
Interest expense, net	(11,254)	(10,008)	(21,022)	(19,684)
Other income (expense), net	(2,008)	1,433	(2,227)	(739)
Income before income taxes	62,464	39,974	104,359	77,130
Income tax provision (benefit)	4,176	6,593	(8,850)	3,742
Net income	58,288	33,381	113,209	73,388
Other comprehensive gain (loss):
Foreign currency translation adjustments	(19,056)	2,925	(4,964)	(340)
Comprehensive income	$ 39,232	$ 36,306	$ 108,245	$ 73,048
Earnings per share:
Basic (in dollars per share)	$ 2.00	$ 1.15	$ 3.89	$ 2.53
Diluted (in dollars per share)	$ 1.94	$ 1.10	$ 3.76	$ 2.42
Shares used in computing earnings per share:
Basic (in shares)	29,194	29,074	29,109	29,017
Diluted (in shares)	29,985	30,259	30,076	30,297
Transactional and Maintenance
Revenues	$ 240,702	$ 211,779	$ 461,076	$ 405,972
Technology Service
Revenues	47,905	50,555	91,930	91,363
License
Revenues	$ 19,364	$ 15,900	$ 53,469	$ 43,155