Basis of Presentation and Principles of Consolidation (Details) (Aerostar Integrated Systems [Member])	Jul. 31, 2013
Aerostar Integrated Systems [Member]
Organization, Consolidation and Presentation of Financial Statements Line Items [Line Items]
Joint venture, ownership percentage	75.00%

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

No definition available.

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant