CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Revenue	$ 1,377,270,000	$ 1,316,536,000	$ 1,294,562,000
Operating expenses:
Cost of revenues	302,174,000	332,462,000	361,142,000
Research and development	146,758,000	171,231,000	166,499,000
Selling, general and administrative	383,863,000	396,281,000	420,930,000
Amortization of intangible assets	2,061,000	3,255,000	4,993,000
Restructuring and impairment charges	0	7,957,000	45,029,000
Gains on product line asset sales and business divestiture	0	(100,139,000)	0
Total operating expenses	834,856,000	811,047,000	998,593,000
Operating income	542,414,000	505,489,000	295,969,000
Interest expense, net	(68,967,000)	(40,092,000)	(42,177,000)
Other income (expense), net	(2,138,000)	7,745,000	3,208,000
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	471,309,000	473,142,000	257,000,000
Provision for income taxes	97,768,000	81,058,000	20,589,000
Net income	373,541,000	392,084,000	236,411,000
Other comprehensive income (loss):
Foreign currency translation adjustments	(48,848,000)	7,141,000	7,090,000
Comprehensive income	$ 324,693,000	$ 399,225,000	$ 243,501,000
Basic earnings per share (in dollars per share)	$ 14.34	$ 13.65	$ 8.13
Shares used in computing basic earnings per share (in shares)	26,042	28,734	29,067
Diluted earnings per share (in dollars per share)	$ 14.18	$ 13.40	$ 7.90
Shares used in computing diluted earnings per share (in shares)	26,347	29,260	29,932
Operating Segments
Revenues:
Revenue	$ 1,377,270,000	$ 1,316,536,000	$ 1,294,562,000
Operating expenses:
Total operating expenses	717,440,000	787,517,000	854,890,000
Operating income	659,830,000	529,019,000	439,672,000
On-premises and SaaS software
Revenues:
Revenue	564,751,000	517,888,000	584,576,000
On-premises and SaaS software | Operating Segments
Revenues:
Revenue	564,751,000	517,888,000	584,576,000
Professional services
Revenues:
Revenue	105,876,000	144,501,000	181,439,000
Professional services | Operating Segments
Revenues:
Revenue	105,876,000	144,501,000	181,439,000
Scores Products
Revenues:
Revenue	706,643,000	654,147,000	528,547,000
Scores Products | Operating Segments
Revenues:
Revenue	$ 706,643,000	$ 654,147,000	$ 528,547,000