Note 9 - Dispositions (Details Textual) - Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] - Market Research Business [Member] - USD ($) $ in Millions		3 Months Ended
	Jul. 01, 2016	Feb. 28, 2017	Aug. 31, 2016
Proceeds from Divestiture of Businesses	$ 165.0
Proceeds from Divestiture of Businesses, Bonus Adjustment	$ 9.7
Gain (Loss) on Disposition of Business, Net of Tax			$ 112.5
Other Expense [Member]
Gain (Loss) on Disposition of Business, Net of Tax		$ (1.2)