Supplemental Cash Flow Information Supplemental cash flow (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Supplemental cash flow [Abstract]
Interest Paid	$ 13,458	$ 12,094	$ 11,937
Income Taxes Paid, Net	$ 17,358	$ 15,103	$ 11,427