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Quarterly Results Of Operations (Schedule of Of Quarterly Results) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Aug. 31, 2015
May. 31, 2015
Feb. 28, 2015
Nov. 30, 2014
Aug. 31, 2014
 [1]
May. 31, 2014
Feb. 28, 2014
Nov. 30, 2013
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Quarterly Results Of Operations [Abstract]                      
Operating revenues $ 123,540 [1] $ 160,707 $ 141,089 $ 134,845 $ 147,522 $ 169,936 $ 152,804 $ 147,671 $ 560,181 $ 617,933 $ 690,848
Cost of operating revenues 90,075 [1] 114,321 101,533 97,931 107,599 121,687 110,132 107,520 403,860 446,938 496,014
Earnings before income taxes 529 [1] 20,423 14,138 11,661 16,549 25,500 20,789 15,817 46,751 78,655 107,307
Net earnings $ (3,181) [1] $ 12,927 $ 8,995 $ 7,568 $ 11,329 $ 16,499 $ 13,450 $ 10,234 $ 26,309 $ 51,512 $ 70,570
Diluted net earnings per share $ (0.28) [1] $ 1.10 $ 0.75 $ 0.62 $ 0.89 $ 1.28 $ 1.04 $ 0.79 $ 2.22 $ 4.00 $ 5.47
Bad debt reserve on accounts receivable $ 5,000                    
Bad debt reserve against foreign income tax assets $ 2,900               $ 2,900    
[1] The fourth quarter 2015 results were impacted by a bad debt reserve of $5.0 million on accounts receivable and a reserve of $2.9 million against foreign income tax assets.