QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2021	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 526,242	$ 826,561	$ 297,212	$ 405,131	$ 754,617	$ 1,128,403	$ 643,892	$ 633,552	$ 2,055,146	$ 3,160,464	$ 3,076,208
Gross profit	187,593	297,755	134,693	124,401	251,088	399,019	231,769	236,064	744,442	1,117,940	1,107,109
Net income	$ 14,642	$ 63,174	$ (14,976)	$ (39,295)	$ 25,288	$ 95,387	$ 11,119	$ 12,043	$ 23,545	$ 143,837	$ 138,067
NET INCOME PER COMMON SHARE:
Basic (in dollars per share)	$ 0.30	$ 1.31	$ (0.31)	$ (0.82)	$ 0.53	$ 2.00	$ 0.23	$ 0.25	$ 0.49	$ 2.98	$ 2.81
Diluted (in dollars per share)	$ 0.30	$ 1.29	$ (0.31)	$ (0.82)	$ 0.52	$ 1.97	$ 0.23	$ 0.24	$ 0.48	$ 2.94	$ 2.75