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Income Taxes (Detail) - A reconciliation of the beginning and ending balances of the total amounts of gross unrecognized tax benefits - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Mar. 31, 2014
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]      
Balance, beginning of year   $ 195 $ 249
Increases in tax positions in the current year   0 0
Settlements   0 (72)
Lapse in statute of limitations $ 0   0
Accrued penalties and interest   7 18
Balance, end of period   $ 202 $ 195