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Components of Interest Expense, Net (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Interest Income Expense Net [Line Items]        
Interest expense $ (4,289) $ (4,024) $ (7,922) $ (7,451)
Interest income 15 10 25 20
Interest expense, net $ (4,274) $ (4,014) $ (7,897) $ (7,431)