Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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Goodwill and Other Intangibles Goodwill and Other Intangibles (Details) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jul. 31, 2016 USD ($)	Apr. 30, 2016 ReportingUnits	Jul. 31, 2015 USD ($)	Jul. 31, 2016 USD ($) ReportingUnits	Jul. 31, 2015 USD ($)	Jan. 31, 2016 ReportingUnits
Goodwill [Line Items]
Goodwill, Impairment Loss \| $	$ 0		$ 0	$ 0	$ 0
Number of Reporting Units \| ReportingUnits				3
Impairment of Intangible Assets, Finite-lived \| $	$ 0		$ 0	$ 0	$ 0
Aerostar Division [Member]
Goodwill [Line Items]
Number of Reporting Units \| ReportingUnits		1				2