Earnings per Share Reconciliation of Weighted Average Common Shares Outstanding for Purposes of Calculating Basic and Diluted Earnings Per Share (Detail) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Weighted average common shares outstanding used in computing basic earnings per share	66,751	66,041	66,583	65,831
Dilutive common stock options and restricted stock awards	902	646	945	0
Weighted average common shares outstanding for purposes of computing diluted earnings per share	67,653	66,687	67,528	65,831