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Amounts Reclassified Out of Accumulated Other Comprehensive Income - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Accumulated Other Comprehensive Income Loss [Line Items]      
Amounts reclassified out of AOCI $ 0 $ 0  
Maximum [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Amounts reclassified out of AOCI pre-tax basis     $ 300,000