CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Statement of Comprehensive Income [Abstract]
Net earnings	$ 104.9	$ 124.1	$ 209.7	$ 249.7
Other comprehensive (loss) earnings, net of tax
Foreign currency translation adjustments	(31.8)	(5.0)	(28.2)	12.2
Unrealized (loss) gain on marketable securities	(1.2)	(0.5)	(0.1)	0.3
Unrealized loss on hedging instruments	(2.7)	(1.3)	(7.1)	(4.8)
Net unrealized gain on benefit plans	4.5	1.6	9.2	3.6
Other comprehensive (loss) earnings, net of tax	(31.2)	(5.2)	(26.2)	11.3
Comprehensive earnings	$ 73.7	$ 118.9	$ 183.5	$ 261.0