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LONG-TERM DEBT - SUMMARY (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020	Jun. 29, 2017	Jun. 18, 2014
Debt Instrument
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	$ 18,673	$ 22,327
Total debt	994,640	837,048
Current maturities of long-term debt	4,250	4,250
Long-term debt	990,390	832,798
1.50% Convertible Senior Notes
Debt Instrument
Principal Amount - 1.50% Convertible Senior Notes	400,000	400,000		$ 400,000
2017 Term Loan
Debt Instrument
2017 Term Loan	413,313	414,375	$ 425,000
2017 Revolving Credit Facility
Debt Instrument
2017 Term Loan	$ 200,000	$ 45,000