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Fair Value Measurement (Detail) (USD $)
Jun. 30, 2014
NESA
Nov. 02, 2012
NESA
Sep. 30, 2013
Jacobs Trading, LLC
Sep. 30, 2012
Jacobs Trading, LLC
Oct. 02, 2011
Jacobs Trading, LLC
Sep. 30, 2014
Recurring basis
Level 1
Sep. 30, 2013
Recurring basis
Level 1
Sep. 30, 2014
Recurring basis
Level 2
Sep. 30, 2013
Recurring basis
Level 2
Sep. 30, 2013
Recurring basis
Level 3
NESA
Fair value measurement                    
Assets, fair value           $ 0 $ 0 $ 0 $ 0  
Liabilities, fair value           0 0 0 0  
Estimated fair value of earn-out $ 0 $ 18,000,000 $ 0 $ 14,500,000 $ 8,300,000         $ 18,390,000