SUPPLEMENTAL CONDENSED CONSOLIDATED FINANCIAL STATEMENT INFORMATION SUPPLEMENTAL CONDENSED CONSOLIDATED FINANCIAL STATEMENT INFORMATION - CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Cash paid for interest	$ 14,736	$ 13,618
Cash payments of income taxes, net	22,324	18,344
Accrued but unpaid purchases of property and equipment	4,443	3,487
Inventory transfers to property and equipment	1,334	1,265
Liabilities for contingent consideration in business combinations, including measurement period adjustments	8,969	9,100
Capital leases of property and equipment	$ 473	$ 1,929