Note 17 - Subsequent Event	3 Months Ended
Nov. 30, 2014
Subsequent Events [Abstract]
Subsequent Events [Text Block]	17. SUBSEQUENT EVENT On December 16, 2014, the U.S. Congress passed the Tax Increase Prevention Act of 2014 (the “ACT”), which President Obama signed into law on December 19, 2014. The ACT reinstated the U.S. Federal R&D tax credit, which had previously expired on December 31, 2013. The reenactment of the credit was retroactive to January 1, 2014 and extended through the end of the 2014 calendar year. Prior to the reenactment of the tax credit, FactSet had not been permitted to factor it into its effective tax rate because it was not currently enacted tax law. The timing of FactSet’s ability to recognize the U.S. Federal R&D tax credit has been volatile due to the number of lapses and retroactive re-enactments. The reenactment is expected to result in discrete income tax benefits between $5.0 million and $6.0 million during the second quarter of fiscal 2015.

Note 17 - Subsequent Event

3 Months Ended

Nov. 30, 2014

17. SUBSEQUENT EVENT

On December 16, 2014, the U.S. Congress passed the Tax Increase Prevention Act of 2014 (the “ACT”), which President Obama signed into law on December 19, 2014. The ACT reinstated the U.S. Federal R&D tax credit, which had previously expired on December 31, 2013. The reenactment of the credit was retroactive to January 1, 2014 and extended through the end of the 2014 calendar year. Prior to the reenactment of the tax credit, FactSet had not been permitted to factor it into its effective tax rate because it was not currently enacted tax law. The timing of FactSet’s ability to recognize the U.S. Federal R&D tax credit has been volatile due to the number of lapses and retroactive re-enactments. The reenactment is expected to result in discrete income tax benefits between $5.0 million and $6.0 million during the second quarter of fiscal 2015.