Commitments and Contingencies (Narrative) (Details) $ in Millions	3 Months Ended
	Apr. 30, 2016 USD ($) lease
Commitments and Contingencies Disclosure [Abstract]
Lessee Leasing Arrangements, Operating Leases, Renewal Term	5 years
Lessee Leasing Arrangements, Operating Leases, Term of Contract	10 years
Number Of Leases | lease	26
Purchase commitments	$ 49.3
Purchase Commitment, Remaining Minimum Amount Committed	$ 2.6