SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - New Accounting Pronouncements Recently Adopted (Details) - USD ($) $ in Thousands	Jan. 31, 2022	Feb. 01, 2021	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019	Jun. 18, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) to stockholders' equity	$ 954,579		$ 1,282,564	$ 1,242,437	$ 1,260,804
Decrease to temporary equity	(436,321)		(205,469)
Increase to current maturities of long-term debt	0		386,713
Decrease to deferred tax liabilities	(9,369)		(25,704)
2014 Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Coupon interest rate						1.50%
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) to stockholders' equity	(54,509)		(113,797)	(105,590)	(134,274)
Additional Paid-in Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) to stockholders' equity	$ 1,125,152		1,726,166	1,660,889	$ 1,586,266
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) to stockholders' equity			1,430	(940)
Decrease to temporary equity		$ 4,800
Increase to current maturities of long-term debt		4,400
Decrease to deferred tax liabilities		900
Increase to debt issuance costs		100
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) to stockholders' equity		44,900	44,875	$ (940)
Cumulative Effect, Period of Adoption, Adjustment | Additional Paid-in Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) to stockholders' equity		$ (43,400)	$ (43,445)