Goodwill and Long-lived Assets (Goodwill and Amortization Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Amortization expense of intangible assets	$ 4.7	$ 6.6
Expected amortization expenses in year one	15.0
Expected amortization expenses in year two	15.0
Expected amortization expenses in year three	15.0
Expected amortization expenses in year four	15.0
Expected amortization expenses in year five	15.0
Energy Services Group
Goodwill increase during period, foreign currency translation	13.1
Goodwill, purchase price adjustment	$ 2.5