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Fair Value Measurements & Derivative Instruments - Fair Value Measurements for Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
Jun. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Marketable securities $ 4,040,795    
Derivative assets 30,011 280,261  
Contingent consideration 173,621 173,621 0
Fair Value, Measurements, Recurring
      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Cash and cash equivalents 29,025,930 3,377,288  
Marketable securities 4,040,795 [1] 106,500 [1]  
Derivative assets    250,250  
Derivative liabilities 2,335,163 647,213  
Contingent consideration 173,621 173,621  
Level 1 | Fair Value, Measurements, Recurring
      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Cash and cash equivalents 29,025,930 3,377,288  
Marketable securities 4,040,795 [1] 106,500 [1]  
Derivative assets       
Level 2 | Fair Value, Measurements, Recurring
      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Derivative assets       
Level 3 | Fair Value, Measurements, Recurring
      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Derivative assets    250,250  
Derivative liabilities 2,335,163 647,213  
Contingent consideration $ 173,621 $ 173,621  
[1] (1) Marketable securities at June 30, 2013 were comprised of investments classified as “held-to-maturity”, and are recorded at amortized cost on the Company’s Consolidated Balance Sheet.