INCOME TAXES INCOME TAXES - UNRECOGNIZED TAX BENEFITS - INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 109,066	$ 115,709	$ 148,639	$ 142,271
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	100,900
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	700	1,500	$ 500
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	4,600	$ 5,600
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 5,800