Basis of Presentation Reclassification (Details) - USD ($) $ in Millions	3 Months Ended
Apr. 30, 2016	Apr. 30, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Operating Expenses	$ 574.4	$ 533.2
Employee Benefits and Estimated Personal Property Liabilities
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Operating Expenses		$ 5.7

Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

No definition available.

Name:	us-gaap_OperatingExpenses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration