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Summary of Significant Accounting Policies - Concentration Risk (Details) $ in Millions	3 Months Ended
	Dec. 31, 2015 USD ($) customer item	Dec. 31, 2014 customer item	Sep. 30, 2015 USD ($)	Jun. 30, 2015 item
Concentration of Credit Risk
Number of banks for maintenance of cash balances | item				2
A Certain Customer
Concentration of Credit Risk
Allowance for doubtful accounts | $	$ 1.3
Net sales | Major Customers
Concentrations
Number of major customers | customer	3	3
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	12.00%	23.00%
Net sales | Major Customers | Pilatus Aircraft Limited
Concentrations
Sales percentage		25.00%
Net sales | Major Customers | Eclipse
Concentrations
Sales percentage		11.00%
Inventory | Supplier Concentration Risk
Concentrations
Number of major suppliers | item	1	2
Delta
Concentration of Credit Risk
Allowance for doubtful accounts | $			$ 3.6

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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=6927468&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=35750535&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=6927468&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
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611

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