CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS (Tables)

12 Months Ended

Jan. 31, 2016

Cash, Cash Equivalents, and Short-term Investments [Abstract]

Schedule of Cash, Cash Equivalents and Short-term Investments [Table Text Block]

The following tables summarize our cash, cash equivalents, and short-term investments as of January 31, 2016 and 2015:

	January 31, 2016
(in thousands)	Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Cash and cash equivalents:
Cash and bank time deposits	$	334,938	$	—	$	—		$	334,938
Money market funds	12,137		—		—			12,137
Corporate debt securities	5,054		—		(24		)	5,030
Total cash and cash equivalents	$	352,129	$	—	$	(24	)	$	352,105
Short-term investments:
Commercial paper and corporate debt securities (available-for-sale)	$	53,018	$	—	$	(86	)	$	52,932
Bank time deposits	3,050		—		—			3,050
Total short-term investments	$	56,068	$	—	$	(86	)	$	55,982

	January 31, 2015
(in thousands)	Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Cash and cash equivalents:
Cash and bank time deposits	$	281,890	$	—	$	—	$	281,890
Money market funds	183		—		—		183
Commercial paper	2,999		—		—		2,999
Total cash and cash equivalents	$	285,072	$	—	$	—	$	285,072
Short-term investments:
Commercial paper and corporate debt securities (available-for-sale)	$	13,741	$	101	$	—	$	13,842
Bank time deposits	21,909		—		—		21,909
Total short-term investments	$	35,650	$	101	$	—	$	35,751