Derivative Instruments and Foreign Currency Exposure (Details Textual) - USD ($)	3 Months Ended
Apr. 30, 2016	Apr. 30, 2015
Derivative [Line Items]
Other Comprehensive Income, Other, Net of Tax	$ 0	$ 115,482
Derivative Financial Instruments, Assets [Member]
Derivative [Line Items]
Other Assets	$ 0	$ 3,300,000

The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

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 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 10
-Article 7

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