Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	36 Months Ended
May 31, 2016	May 31, 2015
KC10 Supply Agreement
Revenue Recognition
Unbilled accounts receivable related to KC10 supply agreement	$ 29.8	$ 21.1
KC10 logistics support services
Revenue Recognition
Average annual revenue recognized for KC10 logistics support services	115.9
Average annual gross profit recognized for KC10 logistics support services	$ 7.4
Minimum
Principles of Consolidation
Percentage of owned aircraft	20.00%
Maximum
Principles of Consolidation
Percentage of owned aircraft	50.00%

Average annual gross profit recognized for KC10 logistics support services.

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Average annual revenue recognized for KC10 logistics support services.

+ References

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3(c)(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 310
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=51666815&loc=d3e55302-109406

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