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Amount Collected and Recognized (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Commitments and Contingencies [Line Items]        
Tuition and interest income excluded $ 6,095 $ 4,426 $ 12,832 $ 7,658
Amounts collected and recognized (568) (409) (1,018) (730)
Amounts written-off (1,469) (1,899) (2,456) (4,698)
Net amount excluded during the period 4,058 2,118 9,358 2,230
Tuition and interest income excluded inception to date 59,714   59,714  
Amounts collected and recognized, Inception to date (3,763)   (3,763)  
Amounts written off, inception to date (17,156)   (17,156)  
Net amount excluded during the period, Inception to date $ 38,795   $ 38,795