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Stock-Based Compensation (Detail) - (Table 5) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Jul. 20, 2017
Aug. 08, 2016
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at January 1, 2012     1,499,000
Outstanding at January 1, 2012 (in Dollars per share)     $ 29.72
Granted   150,000 1,054,000
Granted (in Dollars per share)     $ 37.53
Exercised     (405,000)
Exercised (in Dollars per share)     $ 27.39
Cancelled/Forfeited     (8,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price     $ 35.02
Outstanding at June 30, 2012     2,140,000
Outstanding at June 30, 2012 (in Dollars per share)     $ 33.98
Outstanding at June 30, 2012     4 years 7 months
Outstanding at June 30, 2012 (in Dollars)     $ 19,937
Exercisable at June 30, 2012     846,000
Exercisable at June 30, 2012 (in Dollars per share)     $ 29.45
Exercisable at June 30, 2012     2 years 6 months
Exercisable at June 30, 2012 (in Dollars)     $ 11,713
Subsequent Event [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Granted 150,000