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LONG-TERM DEBT - SUMMARY (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jun. 29, 2017	Jan. 31, 2017	Jun. 18, 2014
Debt Instrument
Unamortized debt discounts and issuance costs	$ 56,961		$ 60,571
Total debt	768,365		748,871
Current maturities of long-term debt	4,577		4,611
Long-term debt	763,788		744,260
1.50% Convertible Senior Notes
Debt Instrument
Principal Amount - 1.50% Convertible Senior Notes	400,000		400,000	$ 400,000
2014 Term Loans
Debt Instrument
Gross term loan borrowings	0		409,038
2017 Term Loan
Debt Instrument
Gross term loan borrowings	425,000	$ 425,000	0
Other debt
Debt Instrument
Other debt	$ 326		$ 404