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Valuation And Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2011
Allowance For Doubtful Accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 1,717 [1] $ 2,340 [1] $ 2,244 [1]
Charges to costs and expenses 1,543 [1] 379 [1] 388 [1]
Deductions 407 [1] 1,002 [1] 292 [1]
Balance at end of period 2,853 [1] 1,717 [1] 2,340 [1]
Allowance For Inventory Obsolescence [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 1,648 [2] 2,167 [2] 2,045 [2]
Charges to costs and expenses 2,632 [2] 1,114 [2] 426 [2]
Charged to other accounts 71 [2] (126) [2] (2) [2]
Deductions 1,262 [2] 1,507 [2] 302 [2]
Balance at end of period $ 3,089 [2] $ 1,648 [2] $ 2,167 [2]
[1] Deductions consist of uncollectible items written off, less recoveries of items previously written off.
[2] Deductions consist of obsolete items sold or scrapped.