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Summary of Significant Accounting Policies - Concentration Risk (Details) $ in Millions	3 Months Ended
	Dec. 31, 2016 USD ($) customer item	Dec. 31, 2015 customer item	Sep. 30, 2016 USD ($)
Concentration of Credit Risk
Number of banks for maintenance of cash balances	2
Net sales | Major Customers
Concentrations
Number of major customers | customer	3	3
Net sales | Major Customers | Sierra Nevada
Concentrations
Sales percentage	32.00%
Net sales | Major Customers | Pilatus
Concentrations
Sales percentage	18.00%
Net sales | Major Customers | DHL
Concentrations
Sales percentage		23.00%
Net sales | Major Customers | ABX
Concentrations
Sales percentage		18.00%
Net sales | Major Customers | DoD
Concentrations
Sales percentage	11.00%	12.00%
Inventory | Supplier Concentration Risk
Concentrations
Number of major suppliers	2	1
Delta
Concentration of Credit Risk
Allowance for doubtful accounts | $	$ 3.6		$ 3.6

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Amount of provision related to unbilled receivables not expected to be collected.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
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-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611

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