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Condensed Consolidated Statements Of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Condensed Consolidated Statements Of Income [Abstract]        
Revenues $ 183,899 $ 136,333 $ 554,184 $ 463,423
Cost of revenues 164,128 117,763 493,222 409,383
Gross profit 19,771 18,570 60,962 54,040
Selling, general and administrative expenses 12,356 10,930 35,737 32,655
Operating income 7,415 7,640 25,225 21,385
Other income (expense):        
Interest expense (174) (227) (617) (594)
Interest income 12 43 18 65
Other (55) 485 (430) 595
Income before income tax expense 7,198 7,941 24,196 21,451
Provision for federal, state and foreign income taxes 2,336 3,018 8,794 8,152
Net income $ 4,862 $ 4,923 $ 15,402 $ 13,299
Basic earnings per common share $ 0.19 $ 0.19 $ 0.59 $ 0.50
Diluted earnings per common share $ 0.19 $ 0.18 $ 0.58 $ 0.50
Weighted average common shares outstanding:        
Basic 25,723 26,425 25,982 26,389
Diluted 26,079 26,723 26,333 26,636