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Debt - Aggregate Schedule of Debt Maturities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Sep. 30, 2010
Debt Instrument [Line Items]    
2013 $ 16,414  
2014 13,164  
2015 8,063  
2016 861,222  
2017 1,500  
Thereafter 1,264,554  
Total $ 2,164,917 $ 750,000