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Segment Information - Revenues and Percentage of Revenues on Customers Basis (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Revenue, Major Customer [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 1,160,083 | $ 1,000,146 | $ 934,983
Experian |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 148,037 | 109,097 | 80,096
TransUnion & Equifax customer |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 183,523 | 142,179 | 99,735
Other customers |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 828,523 | $ 748,870 | $ 755,152
Revenue Benchmark | Customer Concentration Risk |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration Risk, Percentage | 100.00% | 100.00% | 100.00%
Revenue Benchmark | Customer Concentration Risk | Experian |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration Risk, Percentage | 13.00% | 11.00% | 9.00%
Revenue Benchmark | Customer Concentration Risk | TransUnion & Equifax customer |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration Risk, Percentage | 16.00% | 14.00% | 11.00%
Revenue Benchmark | Customer Concentration Risk | Other customers |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration Risk, Percentage | 71.00% | 75.00% | 80.00%

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