Annual report pursuant to Section 13 and 15(d)

Earnings per share - Narrative (Details)

v3.5.0.2
Earnings per share - Narrative (Details) - shares
shares in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Unvested restricted stock units      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Awards excluded from the calculation of diluted earnings per share (in shares) 21 15 286