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Subsequent Events - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Nov. 28, 2016
Nov. 09, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Subsequent Event [Line Items]          
Dividend declared per share (USD per share)     $ 0.40 $ 0.40 $ 0.34
Total purchase price, net of cash acquired     $ 125,248 $ 14,450 $ 35,625
Subsequent Event          
Subsequent Event [Line Items]          
Dividend declared per share (USD per share)   $ 0.1      
Subsequent Event | Cool Lab, LLC          
Subsequent Event [Line Items]          
Percentage of voting interests acquired 100.00%        
Total purchase price, net of cash acquired $ 5,000        
Carrying value of non-cash consideration transfered $ 9,100