Revenue from Contracts with Customers - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2026	Mar. 31, 2025	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Total revenues	$ 691,677		$ 498,735		$ 1,203,636	$ 938,703
Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage	100.00%		100.00%		100.00%	100.00%
Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage	100.00%		100.00%		100.00%	100.00%
Scores
Disaggregation of Revenue [Line Items]
Total revenues	$ 474,973		$ 297,039		$ 779,507	$ 532,714
Scores | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage	100.00%		100.00%		100.00%	100.00%
Software
Disaggregation of Revenue [Line Items]
Total revenues	$ 216,704		$ 201,696		$ 424,129	$ 405,989
TransUnion, Equifax and Experian customers | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage	64.00%		52.00%		58.00%	49.00%
TransUnion | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%
Equifax | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%
Experian | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage	10.00%	10.00%	10.00%	10.00%	10.00%	10.00%
Two Customers | Accounts Receivable | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage							10.00%
Three Customers | Accounts Receivable | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage					10.00%
On-premises software | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage	39.00%		45.00%		39.00%	45.00%
On-premises software | Software
Disaggregation of Revenue [Line Items]
Total revenues	$ 78,604		$ 82,300		$ 151,163	$ 165,135
SaaS software | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage	61.00%		55.00%		61.00%	55.00%
SaaS software | Software
Disaggregation of Revenue [Line Items]
Total revenues	$ 120,627		$ 101,526		$ 236,289	$ 204,702
On-premises and SaaS software
Disaggregation of Revenue [Line Items]
Total revenues	$ 199,231		$ 183,826		$ 387,452	$ 369,837
On-premises and SaaS software | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage	100.00%		100.00%		100.00%	100.00%
On-premises and SaaS software | Software
Disaggregation of Revenue [Line Items]
Total revenues	$ 199,231		$ 183,826		$ 387,452	$ 369,837
On-premises and SaaS software | Software recognized at a point in time | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage	12.00%		14.00%		10.00%	13.00%
On-premises and SaaS software | Software recognized at a point in time | Software
Disaggregation of Revenue [Line Items]
Total revenues	$ 23,639		$ 25,609		$ 40,069	$ 48,417
On-premises and SaaS software | Software recognized over contract term | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage	88.00%		86.00%		90.00%	87.00%
On-premises and SaaS software | Software recognized over contract term | Software
Disaggregation of Revenue [Line Items]
Total revenues	$ 175,592		$ 158,217		$ 347,383	$ 321,420
Platform software | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage	44.00%		31.00%		42.00%	30.00%
Platform software | Software
Disaggregation of Revenue [Line Items]
Total revenues	$ 86,963		$ 56,464		$ 160,820	$ 110,286
Non-platform software | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage	56.00%		69.00%		58.00%	70.00%
Non-platform software | Software
Disaggregation of Revenue [Line Items]
Total revenues	$ 112,268		$ 127,362		$ 226,632	$ 259,551
Business-to-business Scores | Scores
Disaggregation of Revenue [Line Items]
Total revenues	$ 417,629		$ 242,494		$ 666,242	$ 424,885
Business-to-business Scores | Scores | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage	88.00%		82.00%		85.00%	80.00%
Business-to-consumer Scores | Scores
Disaggregation of Revenue [Line Items]
Total revenues	$ 57,344		$ 54,545		$ 113,265	$ 107,829
Business-to-consumer Scores | Scores | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage	12.00%		18.00%		15.00%	20.00%
Americas
Disaggregation of Revenue [Line Items]
Total revenues	$ 622,086		$ 429,002		$ 1,075,299	$ 808,877
Americas | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage	90.00%		86.00%		89.00%	86.00%
Americas | Scores
Disaggregation of Revenue [Line Items]
Total revenues	$ 470,973		$ 291,982		$ 773,221	$ 524,948
Americas | Software
Disaggregation of Revenue [Line Items]
Total revenues	151,113		137,020		302,078	283,929
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	$ 47,389		$ 43,400		$ 86,329	$ 79,759
Europe, Middle East and Africa | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage	7.00%		9.00%		7.00%	9.00%
Europe, Middle East and Africa | Scores
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,568		$ 1,667		$ 4,209	$ 3,544
Europe, Middle East and Africa | Software
Disaggregation of Revenue [Line Items]
Total revenues	44,821		41,733		82,120	76,215
Asia Pacific
Disaggregation of Revenue [Line Items]
Total revenues	$ 22,202		$ 26,333		$ 42,008	$ 50,067
Asia Pacific | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage	3.00%		5.00%		4.00%	5.00%
Asia Pacific | Scores
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,432		$ 3,390		$ 2,077	$ 4,222
Asia Pacific | Software
Disaggregation of Revenue [Line Items]
Total revenues	20,770		22,943		39,931	45,845
United States
Disaggregation of Revenue [Line Items]
Total revenues	$ 565,900		$ 383,500		$ 967,800	$ 714,500