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Variable Interest Entity, acquisition date equity method investment: The date the Company acquired equity interest in a VIE

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Variable Interest Entity, name of investee equity method investment: The name of the investee whose equity securities the Company acquired.

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Amount of deferred costs for long-term contracts and programs. Includes, but is not limited to, initial tooling costs and deferred production costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Additions made to capitalized computer software costs during the period.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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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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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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Summary of Significant Accounting Policies (Details)	3 Months Ended	12 Months Ended
Summary of Significant Accounting Policies (Details)	Apr. 30, 2016 ReportingUnits	Jan. 31, 2017 USD ($)	Jan. 31, 2017 USD ($) Divisions	Jan. 31, 2017 USD ($)	Jan. 31, 2017 USD ($) ReportingUnits	Jan. 31, 2016 USD ($) ReportingUnits	Jan. 31, 2015 USD ($) ReportingUnits
Basis of Presentation and Principles of Consolidation
Number of divisions operated in by Parent	3		3		3	4	4
Noncontrolling Interest
Payments to Noncontrolling Interests				$ 0		$ 0	$ 0
Equity Investments [Abstract]
Percentage of voting interest acquired		22.00%	22.00%	22.00%	22.00%
Pre-Contract Costs [Abstract]
Pre-contract costs deferred to inventory		$ 0	$ 0	$ 0	$ 0	0	0
Property, Plant and Equipment [Abstract]
Capitalized software costs				$ 0		$ 0	$ 0
Minimum [Member]
Intangible Assets
Finite-lived intangible assets, useful life, minimum, years		3 years
Maximum [Member]
Intangible Assets
Finite-lived intangible assets, useful life, minimum, years		20 years
Building and Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment useful lives		15 years
Building and Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment useful lives		39 years
Machinery and Equipment [Member] \| Applied Technology [Member] \| Minimum [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment useful lives		3 years
Machinery and Equipment [Member] \| Applied Technology [Member] \| Maximum [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment useful lives		5 years
Machinery and Equipment [Member] \| Engineered Films [Member] \| Minimum [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment useful lives		5 years
Machinery and Equipment [Member] \| Engineered Films [Member] \| Maximum [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment useful lives		12 years
Machinery and Equipment [Member] \| Aerostar [Member] \| Minimum [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment useful lives		3 years
Machinery and Equipment [Member] \| Aerostar [Member] \| Maximum [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment useful lives		5 years
Furniture, Fixtures, Office Equipment and Other [Member] \| Minimum [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment useful lives		3 years
Furniture, Fixtures, Office Equipment and Other [Member] \| Maximum [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment useful lives		7 years
Software Development [Member] \| All Segments [Member] \| Minimum [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment useful lives		3 years
Software Development [Member] \| All Segments [Member] \| Maximum [Member]
Property, Plant and Equipment [Abstract]
Property, plant and equipment useful lives		5 years
Aerostar Integrated Systems [Member]
Noncontrolling Interest
Joint venture, ownership percentage		75.00%	75.00%	75.00%	75.00%
AgEagle Aerial Systems [Member] \| Applied Technology [Member]
Equity Investments [Abstract]
Variable Interest Entity, acquisition date equity method investment		Feb. 29, 2016
Percentage of voting interest acquired		5.00%	5.00%	5.00%	5.00%
Variable Interest Entity, name of investee equity method investment		Ag-Eagle Aerial Systems, Inc.
SST [Member] \| Applied Technology [Member]
Equity Investments [Abstract]
Percentage of voting interest acquired		22.00%	22.00%	22.00%	22.00%
Variable Interest Entity, name of investee equity method investment		Site-Specific Technology Development Group, Inc.