Recent Accounting Pronouncements (Details Textuals) $ in Millions	9 Months Ended
	Oct. 31, 2017 USD ($)
Selling general and administrative expenses
New Accounting Pronouncement, Early Adoption [Line Items]
Reclassifications of operating expenses	$ 26.0
Minimum
New Accounting Pronouncement, Early Adoption [Line Items]
Transition adjustment estimated retained earnings	23.0
Maximum
New Accounting Pronouncement, Early Adoption [Line Items]
Transition adjustment estimated retained earnings	$ 30.0