INCOME TAXES - Summary of Significant Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Deferred Income Tax Assets:
Compensation	$ 8,379	$ 10,605
Inventory	4,498	2,244
Straight-line lease		6,642
Provision for bad debts and sales allowances	34,197	33,221
Supplemental employee retirement plan	511	401
Net operating loss	4,877	3,362
Operating lease liability	67,044
Other	1,148	2,891
Gross deferred income tax assets	120,654	59,366
Less: valuation allowance	(4,929)	(2,303)
Net deferred income tax assets	115,725	57,063
Deferred income tax liabilities:
Depreciation and amortization	(33,539)	(25,617)
Intangibles	(13,602)	(21,742)
Operating lease asset	(55,801)
Prepaid expenses and other	(2,600)	(2,405)
Total deferred income tax liabilities	(105,542)	(49,764)
Net deferred tax assets	$ 10,183	$ 7,299