Basis of Presentation: (Details) $ in Millions	3 Months Ended
	Apr. 30, 2016 USD ($)
Selling, General and Administrative Expenses
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Prior period reclassification adjustment	$ 0.7
Cost of Goods Sold
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Prior period reclassification adjustment	$ (0.7)