CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Revenues
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,160,083	$ 1,000,146	$ 934,983
Operating expenses:
Cost of revenues	336,845	312,898	287,607
Research and development	149,478	128,383	110,870
Selling, general and administrative	414,086	376,912	337,167
Amortization of intangible assets	6,126	6,594	12,709
Restructuring and acquisition-related	0	0	4,471
Total operating expenses	906,535	824,787	752,824
Operating income	253,548	175,359	182,159
Interest expense, net	(39,752)	(31,311)	(25,790)
Other income (expense), net	2,276	12,884	(86)
Income before income taxes	216,072	156,932	156,283
Provision for income taxes	23,948	30,450	22,869
Net income	192,124	126,482	133,414
Other comprehensive income (loss):
Foreign currency translation adjustments	(13,664)	(9,926)	10,517
Comprehensive income	$ 178,460	$ 116,556	$ 143,931
Basic earnings per share (in dollars per share)	$ 6.63	$ 4.26	$ 4.32
Shares used in computing basic earnings per share (in shares)	28,980	29,711	30,862
Diluted earnings per share (in dollars per share)	$ 6.34	$ 4.06	$ 4.14
Shares used in computing diluted earnings per share (in shares)	30,294	31,180	32,245
Transactional and maintenance
Revenues
Revenue from Contract with Customer, Excluding Assessed Tax	$ 860,948	$ 750,603	$ 633,927
Professional services
Revenues
Revenue from Contract with Customer, Excluding Assessed Tax	184,095	176,910	177,904
License
Revenues
Revenue from Contract with Customer, Excluding Assessed Tax	$ 115,040	$ 72,633	$ 123,152