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Revenues and Percentage of Revenues by Reportable Market Segments (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended12 Months Ended
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2009
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Segment Reporting Information [Line Items]           
Revenues$ 160,249$ 150,679$ 152,824$ 155,931$ 155,098$ 155,329$ 143,720$ 151,496$ 619,683$ 605,643$ 630,735
Concentration of risk percentage100.00%   100.00%   100.00%100.00%100.00%
Applications | Geographic Concentration Risk
           
Segment Reporting Information [Line Items]           
Revenues        383,028367,258383,130
Applications | Geographic Concentration Risk | Sales Revenue, Services, Net
           
Segment Reporting Information [Line Items]           
Concentration of risk percentage62.00%   61.00%   62.00%61.00%61.00%
Scores | Geographic Concentration Risk
           
Segment Reporting Information [Line Items]           
Revenues        168,567172,339179,575
Scores | Geographic Concentration Risk | Sales Revenue, Services, Net
           
Segment Reporting Information [Line Items]           
Concentration of risk percentage27.00%   28.00%   27.00%28.00%28.00%
Tools | Geographic Concentration Risk
           
Segment Reporting Information [Line Items]           
Revenues        68,08866,04668,030
Tools | Geographic Concentration Risk | Sales Revenue, Services, Net
           
Segment Reporting Information [Line Items]           
Concentration of risk percentage11.00%   11.00%   11.00%11.00%11.00%
Geographic Concentration Risk
           
Segment Reporting Information [Line Items]           
Revenues        619,683605,643630,735
Geographic Concentration Risk | Sales Revenue, Services, Net
           
Segment Reporting Information [Line Items]           
Concentration of risk percentage100.00%   100.00%   100.00%100.00%100.00%
Applications
           
Segment Reporting Information [Line Items]           
Revenues        383,028367,258383,130
Scores
           
Segment Reporting Information [Line Items]           
Revenues        168,567172,339179,575
Tools
           
Segment Reporting Information [Line Items]           
Revenues        $ 68,088$ 66,046$ 68,030