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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Statement of Comprehensive Income [Abstract]        
Revenues $ 88,192 $ 91,235 $ 177,965 $ 186,915
Operating expenses:        
Educational services and facilities 49,770 48,143 99,422 95,973
Selling, general and administrative 44,192 40,690 86,506 82,940
Total operating expenses 93,962 88,833 185,928 178,913
Income (loss) from operations (5,770) 2,402 (7,963) 8,002
Other (expense) income:        
Interest expense, net (797) (481) (1,614) (980)
Equity in earnings of unconsolidated affiliates 104 136 239 254
Other income 124 133 378 245
Total other (expense) income, net (569) (212) (997) (481)
Income (loss) before income taxes (6,339) 2,190 (8,960) 7,521
Income tax expense 25,663 1,635 24,722 3,872
Net income (loss) (32,002) 555 (33,682) 3,649
Equity interest in investee's unrealized gains on hedging derivatives, net of taxes 0 6 (1) 17
Comprehensive income (loss) $ (32,002) $ 561 $ (33,683) $ 3,666
Earnings per share:        
Net income (loss) per share - basic $ (1.32) $ 0.02 $ (1.39) $ 0.15
Net income (loss) per share - diluted $ (1.32) $ 0.02 $ (1.39) $ 0.15
Weighted average number of shares outstanding:        
Basic 24,270 24,463 24,252 24,647
Diluted 24,270 24,551 24,252 24,741
Cash dividends declared per common share $ 0.02 $ 0.10 $ 0.04 $ 0.2