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SEGMENTS - Method of Overhead Allocation (Details) - USD ($)
$ 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
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues $ 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
Long-Lived Assets 1,092,346       1,196,449       1,092,346 1,196,449 954,163
United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 1,755,791 2,774,492 2,656,479
Long-Lived Assets 834,181       964,476       834,181 964,476 762,444
Non-United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenues                 299,355 385,972 419,729
Long-Lived Assets $ 258,165       $ 231,973       $ 258,165 $ 231,973 $ 191,719