Annual report pursuant to Section 13 and 15(d)

Earnings per share - Schedule of the Components of Basic and Diluted Earnings Per Share (Details)

v3.8.0.1
Earnings per share - Schedule of the Components of Basic and Diluted Earnings Per Share (Details) - shares
shares in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share [Abstract]      
Weighted average shares outstanding 65,632 65,822 66,682
Effect of employee stock options and unvested restricted stock awards 433 407 593
Denominator for diluted earnings per share 66,065 66,229 67,275