CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Revenues:
Revenue	$ 1,717,526	$ 1,513,557	$ 1,377,270
Operating expenses:
Cost of revenues	348,206	311,053	302,174
Research and development	171,940	159,950	146,758
Selling, general and administrative	462,834	400,565	383,863
Amortization of intangible assets	917	1,100	2,061
Gain on product line asset sale	0	(1,941)	0
Total operating expenses	983,897	870,727	834,856
Operating income	733,629	642,830	542,414
Interest expense, net	(105,638)	(95,546)	(68,967)
Other income (expense), net	14,034	6,340	(2,138)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	642,025	553,624	471,309
Provision for income taxes	129,214	124,249	97,768
Net income	512,811	429,375	373,541
Other comprehensive income (loss):
Foreign currency translation adjustments	10,516	22,557	(48,848)
Comprehensive income	$ 523,327	$ 451,932	$ 324,693
Basic earnings per share (in dollars per share)	$ 20.78	$ 17.18	$ 14.34
Shares used in computing basic earnings per share (in shares)	24,676	24,986	26,042
Diluted earnings per share (in dollars per share)	$ 20.45	$ 16.93	$ 14.18
Shares used in computing diluted earnings per share (in shares)	25,079	25,367	26,347
Operating Segments
Revenues:
Revenue	$ 1,717,526	$ 1,513,557	$ 1,377,270
Operating expenses:
Total operating expenses	833,541	747,721	717,440
Operating income	883,985	765,836	659,830
On-premises and SaaS software
Revenues:
Revenue	711,340	640,182	564,751
On-premises and SaaS software | Operating Segments
Revenues:
Revenue	711,340	640,182	564,751
Professional services
Revenues:
Revenue	86,536	99,547	105,876
Professional services | Operating Segments
Revenues:
Revenue	86,536	99,547	105,876
Scores Products
Revenues:
Revenue	919,650	773,828	706,643
Scores Products | Operating Segments
Revenues:
Revenue	$ 919,650	$ 773,828	$ 706,643