Schedule of Changes in Outstanding Common Shares and Treasury Stock (Detail)	11 Months Ended	12 Months Ended
	Oct. 02, 2015 shares	Sep. 30, 2016 shares
Equity [Abstract]
Shares issued, beginning of year	32,123,717	32,378,185
Shares issued under share-based compensation plans	254,468	186,067
Shares issued, end of year	32,378,185	32,564,252
Treasury stock purchased, beginning of year	(269,228)	(2,831,350)
Treasury stock purchased	(2,562,122)	(304,577)
Treasury stock purchased, end of year	(2,831,350)	(3,135,927)
Shares outstanding, end of year	29,546,835	29,428,325