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Components of Interest Expense, Net (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Interest Income Expense Net [Line Items]        
Interest expense $ (5,444) $ (3,547) $ (13,366) $ (10,998)
Interest income 17 11 42 31
Interest expense, net $ (5,427) $ (3,536) $ (13,324) $ (10,967)