Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenues	$ 344,870	$ 322,361
Revenue from Contract with Customer Benchmark [Member] | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	100.00%	100.00%
Revenue from Contract with Customer Benchmark [Member] | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	100.00%	100.00%
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration Risk, Number of Customers	2	2
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk | TransUnion, Equifax and Experian customers
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	36.00%	38.00%
On-premises and SaaS software
Disaggregation of Revenue [Line Items]
Total revenues	$ 144,560	$ 126,338
On-premises and SaaS software | Revenue from Contract with Customer Benchmark [Member] | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	100.00%	100.00%
On-premises and SaaS software | Revenue from Contract with Customer Benchmark [Member] | Product Concentration Risk | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	8.00%	6.00%
On-premises and SaaS software | Revenue from Contract with Customer Benchmark [Member] | Product Concentration Risk | Transferred over Time
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	92.00%	94.00%
On-Premises | Revenue from Contract with Customer Benchmark [Member] | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	45.00%	45.00%
SaaS Products | Revenue from Contract with Customer Benchmark [Member] | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	55.00%	55.00%
Platform software | Revenue from Contract with Customer Benchmark [Member] | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	21.00%	17.00%
Non-platform software | Revenue from Contract with Customer Benchmark [Member] | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	79.00%	83.00%
Americas
Disaggregation of Revenue [Line Items]
Total revenues	$ 291,127	$ 264,897
Americas | Revenue from Contract with Customer Benchmark [Member] | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	85.00%	82.00%
EMEA
Disaggregation of Revenue [Line Items]
Total revenues	$ 32,340	$ 38,891
EMEA | Revenue from Contract with Customer Benchmark [Member] | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	9.00%	12.00%
Asia Pacific
Disaggregation of Revenue [Line Items]
Total revenues	$ 21,403	$ 18,573
Asia Pacific | Revenue from Contract with Customer Benchmark [Member] | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	6.00%	6.00%
Scores
Disaggregation of Revenue [Line Items]
Total revenues	$ 177,988	$ 169,487
Scores | Revenue from Contract with Customer Benchmark [Member] | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	100.00%	100.00%
Scores | Business to business Scores
Disaggregation of Revenue [Line Items]
Total revenues	$ 124,905	$ 112,968
Scores | Business to business Scores | Revenue from Contract with Customer Benchmark [Member] | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	70.00%	67.00%
Scores | Business to consumer Scores
Disaggregation of Revenue [Line Items]
Total revenues	$ 53,083	$ 56,519
Scores | Business to consumer Scores | Revenue from Contract with Customer Benchmark [Member] | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	30.00%	33.00%
Scores | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	$ 177,988	$ 169,487
Scores | Operating Segments | On-premises and SaaS software
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Scores | Americas
Disaggregation of Revenue [Line Items]
Total revenues	173,297	165,712
Scores | EMEA
Disaggregation of Revenue [Line Items]
Total revenues	1,348	1,493
Scores | Asia Pacific
Disaggregation of Revenue [Line Items]
Total revenues	3,343	2,282
Software
Disaggregation of Revenue [Line Items]
Total revenues	166,882	152,874
Software | On-premises and SaaS software
Disaggregation of Revenue [Line Items]
Total revenues	144,560	126,338
Software | On-premises and SaaS software | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Total revenues	11,803	7,159
Software | On-premises and SaaS software | Transferred over Time
Disaggregation of Revenue [Line Items]
Total revenues	132,757	119,179
Software | On-Premises
Disaggregation of Revenue [Line Items]
Total revenues	64,922	57,295
Software | SaaS Products
Disaggregation of Revenue [Line Items]
Total revenues	79,638	69,043
Software | Platform software
Disaggregation of Revenue [Line Items]
Total revenues	30,828	22,072
Software | Non-platform software
Disaggregation of Revenue [Line Items]
Total revenues	113,732	104,266
Software | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenues	166,882	152,874
Software | Operating Segments | On-premises and SaaS software
Disaggregation of Revenue [Line Items]
Total revenues	144,560	126,338
Software | Americas
Disaggregation of Revenue [Line Items]
Total revenues	117,830	99,185
Software | EMEA
Disaggregation of Revenue [Line Items]
Total revenues	30,992	37,398
Software | Asia Pacific
Disaggregation of Revenue [Line Items]
Total revenues	$ 18,060	$ 16,291