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Summary of Significant Accounting Policies (Details 6) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Calculation of basic and diluted net income per share                      
Net income - K12 $ 1,801 $ 6,977 $ 4,165 $ 4,600 $ (2,844) $ 5,599 $ 7,839 $ 2,198 $ 17,543 $ 12,792 $ 21,525
Amount allocated to participating Series A stockholders                 (1,252) (1,031)  
Income available to common stockholders - basic                 16,291 11,761 21,525
Weighted average common shares - basic historical 35,952,162 35,876,829 35,755,685 35,629,836 34,460,563 30,958,807 30,565,683 30,343,696 35,802,678 31,577,758 29,791,973
Basic net income per share (in dollars per share) $ 0.05 $ 0.18 $ 0.11 $ 0.12 $ (0.08) $ 0.17 $ 0.24 $ 0.07 $ 0.46 $ 0.37 $ 0.72
Income available to common stockholders - diluted                 $ 16,291 $ 11,761 $ 21,525
Effect of dilutive stock options and restricted stock awards (in shares)                 188,185 537,003 456,710
Weighted average common shares outstanding - diluted 35,973,316 35,913,576 35,976,779 35,954,075 34,460,563 31,758,313 31,128,286 30,805,106 35,990,863 32,114,761 30,248,683
Diluted net income per share (in dollars per share) $ 0.05 $ 0.18 $ 0.11 $ 0.12 $ (0.08) $ 0.16 $ 0.23 $ 0.07 $ 0.45 $ 0.37 $ 0.71
Additional Information                      
Number of shares of common stock outstanding 36,436,933       35,927,452       36,436,933 35,927,452  
Anti-dilutive stock options not included in calculation of earnings per share (in shares)                 858,986 317,913 1,048,749
Common Stock - A
                     
Issuance of Special A stock in connection with acquisition (in shares)                   2,750,000  
Conversion into common stock ratio                   1