Derivative Instruments | Cash Flow Hedges - Impact on AOCI (Details) $ in Thousands	3 Months Ended
	Apr. 30, 2019 USD ($)
Cash Flow Hedges - Impact on AOCI [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	$ (575)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	(364)
Interest Expense
Cash Flow Hedges - Impact on AOCI [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	120
Other Nonoperating Income (Expense) [Member]
Cash Flow Hedges - Impact on AOCI [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	$ (484)