Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

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The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
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-URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
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Property and Equipment, net Other (Details) - USD ($)	12 Months Ended
Property and Equipment, net Other (Details) - USD ($)	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Depreciation expense	$ 5,993,000	$ 8,116,000	$ 8,930,000
Tier II helicopter demonstration assets and exclusive license agreement \| SG&A
Impairment charge			3,317,000
Tier II helicopter demonstration assets \| SG&A
Impairment charge			2,645,000
Exclusive distribution license \| SG&A
Impairment charge			$ 672,000
Computer equipment and software
Depreciation expense	455,000
Property and equipment under capital lease, cost	1,836,000
Accumulated depreciation of asset under capital lease	$ 1,058,000