INCOME TAXES INCOME TAXES - UNRECOGNIZED TAX BENEFITS - INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 115,709	$ 148,639	$ 142,271	$ 159,648
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	105,400
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	1,500	500	$ 4,400
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	5,600	$ 3,900
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 6,900