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Revenues And Percentage Of Revenues By Reportable Market Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 221,570 | $ 197,610 | $ 185,462 | $ 184,343 | $ 190,327 | $ 183,772 | $ 179,325 | $ 190,020 | $ 788,985 | $ 743,444 | $ 676,423
Concentration of risk, percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Applications |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 504,256 | 476,084 | 424,604
Applications | Sales Revenue, Services, Net |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of risk, percentage |  |  |  |  |  |  |  |  | 64.00% | 64.00% | 63.00%
Scores |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 186,469 | 180,813 | 175,623
Scores | Sales Revenue, Services, Net |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of risk, percentage |  |  |  |  |  |  |  |  | 24.00% | 24.00% | 26.00%
Tools |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 98,260 | $ 86,547 | $ 76,196
Tools | Sales Revenue, Services, Net |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of risk, percentage |  |  |  |  |  |  |  |  | 12.00% | 12.00% | 11.00%

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