Acquisitions (Schedule Of Identifiable Intangible Assets At Fair Value) (Details) (Elecsys Corporation [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
	Feb. 28, 2015
Business Acquisition [Line Items]
Weighted average useful life in years	13 years 8 months 12 days
Fair Value of Identifiable Asset	$ 24,850
Customer Relationships [Member]
Business Acquisition [Line Items]
Weighted average useful life in years	11 years 6 months
Fair Value of Identifiable Asset	13,570
Tradenames [Member]
Business Acquisition [Line Items]
Weighted average useful life in years	19 years 8 months 12 days
Fair Value of Identifiable Asset	6,030
Developed Technology (Proprietary) [Member]
Business Acquisition [Line Items]
Weighted average useful life in years	14 years 8 months 12 days
Fair Value of Identifiable Asset	4,420
Non-compete Agreements [Member]
Business Acquisition [Line Items]
Weighted average useful life in years	4 years 6 months
Fair Value of Identifiable Asset	430
Backlog [Member]
Business Acquisition [Line Items]
Weighted average useful life in years	4 months 24 days
Fair Value of Identifiable Asset	$ 400