Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594

Name:	us-gaap_CostMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Investments - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
Investments - Narrative (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Investment [Line Items]
Total equity investment in privately traded companies	$ 20,200
Minimum [Member]
Investment [Line Items]
Investment maturity period	3 months
Short-term Investments [Member] \| Minimum [Member]
Investment [Line Items]
Investment maturity period	3 months
Short-term Investments [Member] \| Maximum [Member]
Investment [Line Items]
Investment maturity period	12 months
Other Long-term Investments [Member] \| Minimum [Member]
Investment [Line Items]
Investment maturity period	12 months
Other Assets [Member]
Investment [Line Items]
Total equity investment in privately traded companies	$ 20,200	$ 20,200