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Quarterly Results Of Operations (Schedule of Of Quarterly Results) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Aug. 31, 2014
May 31, 2014
Feb. 28, 2014
Nov. 30, 2013
Aug. 31, 2013
May 31, 2013
Feb. 28, 2013
Nov. 30, 2012
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Quarterly Results Of Operations [Abstract]                      
Operating revenues $ 147,522 $ 169,936 $ 152,804 $ 147,671 $ 148,397 $ 219,542 $ 175,539 $ 147,370 $ 617,933 $ 690,848 $ 551,255
Cost of operating revenues 107,599 121,687 110,132 107,520 109,820 156,506 125,175 104,513 446,938 496,014 402,737
Earnings before income taxes 16,549 25,500 20,789 15,817 15,686 39,750 29,488 22,383 78,655 107,307 65,108
Net earnings $ 11,329 $ 16,499 $ 13,450 $ 10,234 $ 10,428 $ 26,063 $ 19,351 $ 14,728 $ 51,512 $ 70,570 $ 43,277
Diluted net earnings per share $ 0.89 $ 1.28 $ 1.04 $ 0.79 $ 0.81 $ 2.01 $ 1.50 $ 1.15 $ 4.00 $ 5.47 $ 3.38