Acquisitions (Schedule Of Consideration Paid And Amounts Of Fair Value Of Assets Acquired And Liabilities Assumed) (Details) - USD ($) $ in Thousands		9 Months Ended
	Jan. 22, 2015	May. 31, 2015	Aug. 31, 2014	May. 31, 2014
Business Acquisition [Line Items]
Goodwill		$ 75,124	$ 37,021	$ 37,211
Total cash consideration, net of cash acquired		$ 67,176
Elecsys Corporation [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	$ 3,401
Receivables	2,006
Inventories	8,467
Other current assets	1,527
Property and equipment	6,457
Intangible assets	24,490
Goodwill	39,266
Other long-term assets	41
Accounts payable and accrued liabilities	(2,762)
Current and long-term debt	(2,478)
Other long-term liabilities	(9,838)
Total cash consideration	70,577
Less cash acquired	(3,401)
Total cash consideration, net of cash acquired	67,176
Add current and long-term debt assumed	2,478
Total purchase price	$ 69,654