REVENUE RECOGNITION - Consolidated Statements of Income (Details) - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
Assets
Accounts receivable, net of allowance for doubtful accounts of $0.9 million and $2.1 million, respectively	$ 502,133	$ 294,430	[1]
Inventories	576,383	553,323
Prepaid expenses and other current assets	96,933	51,014
Deferred income tax assets, net	22,427	11,439
Liabilities
Accrued expenses	(102,841)	(95,055)
Customer refund liabilities	(243,589)
Equity
Retained earnings	(758,881)	$ (674,542)
Without Adoption of ASC 606
Assets
Accounts receivable, net of allowance for doubtful accounts of $0.9 million and $2.1 million, respectively	322,785
Inventories	618,902
Prepaid expenses and other current assets	58,792
Deferred income tax assets, net	5,883
Liabilities
Accrued expenses	(102,425)
Equity
Retained earnings	(811,372)
Impact of Adoption of ASC 606
Assets
Accounts receivable, net of allowance for doubtful accounts of $0.9 million and $2.1 million, respectively	179,348
Inventories	(42,519)
Prepaid expenses and other current assets	38,141
Deferred income tax assets, net	16,544
Liabilities
Accrued expenses	(416)
Customer refund liabilities	(243,589)
Equity
Retained earnings	$ 52,491

[1] Also, net of accrued returns of $61.2 million and sales discounts of $102.1 million