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Supplemental Disclosure of Cash Flow Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash paid during the period for:    
Income taxes, net $ 15,411 $ 28,746
Interest 5,082 13,283
Non-cash investing activities:    
Acquisition of NYC heating oil customer list   886
Non-cash operating activities:    
Increase in interest expense-amortization of debt discount on 8.875% Senior Notes and amortization of deferred charges on senior secured term loan $ 214 $ 91