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Disaggregation of Revenue (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2025
USD ($)
Segment
customer
Mar. 31, 2024
USD ($)
Segment
Mar. 31, 2025
USD ($)
Segment
customer
Mar. 31, 2024
USD ($)
Segment
Sep. 30, 2024
customer
Disaggregation of Revenue [Line Items]          
Total revenues $ 498,735 $ 433,809 $ 938,703 $ 815,868  
Revenue from Contract with Customer Benchmark | Product Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration Risk, Percentage 100.00% 100.00% 100.00% 100.00%  
Revenue from Contract with Customer Benchmark | Geographic Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration Risk, Percentage 100.00% 100.00% 100.00% 100.00%  
Revenue from Contract with Customer Benchmark | Customer Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration Risk, Revenue, Number of Customers | Segment (3) (3) (3) (3)  
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | TransUnion, Equifax and Experian customers          
Disaggregation of Revenue [Line Items]          
Concentration Risk, Percentage 52.00% 47.00% 49.00% 43.00%  
Accounts Receivable | Customer Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration Risk, Receivables, Number of Customers | customer 3   3   1
On-premises and SaaS software          
Disaggregation of Revenue [Line Items]          
Total revenues $ 183,826 $ 177,180 $ 369,837 $ 345,848  
On-premises and SaaS software | Revenue from Contract with Customer Benchmark | Product Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration Risk, Percentage 100.00% 100.00% 100.00% 100.00%  
On-premises and SaaS software | Revenue from Contract with Customer Benchmark | Product Concentration Risk | Transferred at Point in Time          
Disaggregation of Revenue [Line Items]          
Concentration Risk, Percentage 14.00% 11.00% 13.00% 10.00%  
On-premises and SaaS software | Revenue from Contract with Customer Benchmark | Product Concentration Risk | Transferred over Time          
Disaggregation of Revenue [Line Items]          
Concentration Risk, Percentage 86.00% 89.00% 87.00% 90.00%  
On-Premises | Revenue from Contract with Customer Benchmark | Product Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration Risk, Percentage 45.00% 45.00% 45.00% 44.00%  
SaaS Products | Revenue from Contract with Customer Benchmark | Product Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration Risk, Percentage 55.00% 55.00% 55.00% 56.00%  
Platform software | Revenue from Contract with Customer Benchmark | Product Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration Risk, Percentage 31.00% 27.00% 30.00% 27.00%  
Non-platform software | Revenue from Contract with Customer Benchmark | Product Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration Risk, Percentage 69.00% 73.00% 70.00% 73.00%  
Operating Segments | On-premises and SaaS software          
Disaggregation of Revenue [Line Items]          
Total revenues     $ 369,837 $ 345,848  
Americas          
Disaggregation of Revenue [Line Items]          
Total revenues $ 429,002 $ 364,017 $ 808,877 $ 682,527  
Americas | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration Risk, Percentage 86.00% 84.00% 86.00% 84.00%  
EMEA          
Disaggregation of Revenue [Line Items]          
Total revenues $ 43,400 $ 42,257 $ 79,759 $ 78,625  
EMEA | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration Risk, Percentage 9.00% 10.00% 9.00% 9.00%  
Asia Pacific          
Disaggregation of Revenue [Line Items]          
Total revenues $ 26,333 $ 27,535 $ 50,067 $ 54,716  
Asia Pacific | Revenue from Contract with Customer Benchmark | Geographic Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration Risk, Percentage 5.00% 6.00% 5.00% 7.00%  
Scores          
Disaggregation of Revenue [Line Items]          
Total revenues $ 297,039 $ 236,885 $ 532,714 $ 428,997  
Scores | Revenue from Contract with Customer Benchmark | Product Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration Risk, Percentage 100.00% 100.00% 100.00% 100.00%  
Scores | Business to business Scores          
Disaggregation of Revenue [Line Items]          
Total revenues $ 242,494 $ 185,508 $ 424,885 $ 325,950  
Scores | Business to business Scores | Revenue from Contract with Customer Benchmark | Product Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration Risk, Percentage 82.00% 78.00% 80.00% 76.00%  
Scores | Business to consumer Scores          
Disaggregation of Revenue [Line Items]          
Total revenues $ 54,545 $ 51,377 $ 107,829 $ 103,047  
Scores | Business to consumer Scores | Revenue from Contract with Customer Benchmark | Product Concentration Risk          
Disaggregation of Revenue [Line Items]          
Concentration Risk, Percentage 18.00% 22.00% 20.00% 24.00%  
Scores | Operating Segments          
Disaggregation of Revenue [Line Items]          
Total revenues $ 297,039 $ 236,885 $ 532,714 $ 428,997  
Scores | Operating Segments | On-premises and SaaS software          
Disaggregation of Revenue [Line Items]          
Total revenues 0 0 0 0  
Scores | Americas          
Disaggregation of Revenue [Line Items]          
Total revenues 291,982 233,723 524,948 418,671  
Scores | EMEA          
Disaggregation of Revenue [Line Items]          
Total revenues 1,667 1,278 3,544 2,586  
Scores | Asia Pacific          
Disaggregation of Revenue [Line Items]          
Total revenues 3,390 1,884 4,222 7,740  
Software          
Disaggregation of Revenue [Line Items]          
Total revenues 201,696 196,924 405,989 386,871  
Software | On-premises and SaaS software          
Disaggregation of Revenue [Line Items]          
Total revenues 183,826 177,180 369,837 345,848  
Software | On-premises and SaaS software | Transferred at Point in Time          
Disaggregation of Revenue [Line Items]          
Total revenues 25,609 20,177 48,417 33,959  
Software | On-premises and SaaS software | Transferred over Time          
Disaggregation of Revenue [Line Items]          
Total revenues 158,217 157,003 321,420 311,889  
Software | On-Premises          
Disaggregation of Revenue [Line Items]          
Total revenues 82,300 79,697 165,135 152,169  
Software | SaaS Products          
Disaggregation of Revenue [Line Items]          
Total revenues 101,526 97,483 204,702 193,679  
Software | Platform software          
Disaggregation of Revenue [Line Items]          
Total revenues 56,464 47,325 110,286 92,498  
Software | Non-platform software          
Disaggregation of Revenue [Line Items]          
Total revenues 127,362 129,855 259,551 253,350  
Software | Operating Segments          
Disaggregation of Revenue [Line Items]          
Total revenues 201,696 196,924 405,989 386,871  
Software | Operating Segments | On-premises and SaaS software          
Disaggregation of Revenue [Line Items]          
Total revenues 183,826 177,180 369,837 345,848  
Software | Americas          
Disaggregation of Revenue [Line Items]          
Total revenues 137,020 130,294 283,929 263,856  
Software | EMEA          
Disaggregation of Revenue [Line Items]          
Total revenues 41,733 40,979 76,215 76,039  
Software | Asia Pacific          
Disaggregation of Revenue [Line Items]          
Total revenues $ 22,943 $ 25,651 $ 45,845 $ 46,976