Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2018
Income Taxes Disclosure [Line Items]
Provisional repatriation transition tax			$ 854
Tax benefit from tax reform act	$ 652	$ 1,695	$ 2,347
Tax rate used for re-measurement of temporary differences expected to be realized during fiscal 2018			24.50%
Tax rate used for re-measurement of remaining temporary differences			21.00%
Accrued Income Taxes Current [Member]
Income Taxes Disclosure [Line Items]
Provisional repatriation transition tax			$ 68
Accrued Income Taxes Noncurrent [Member]
Income Taxes Disclosure [Line Items]
Provisional repatriation transition tax			$ 786