Quarterly report pursuant to Section 13 or 15(d)

Business Acquisition - Proforma of Revenues and Net Income (Detail)

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Business Acquisition - Proforma of Revenues and Net Income (Detail) - Scruggs Company [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]        
Revenues $ 206,924 $ 173,663 $ 519,735 $ 450,484
Net income $ 15,379 $ 8,775 $ 40,653 $ 20,582