Earnings Per Share  | 
9 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2017  | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Earnings Per Share [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Earnings Per Share | 
 Earnings Per Share 
The weighted average number of shares outstanding used to compute earnings per share was as follows: 
 All of our unvested restricted stock units (RSUs) are included in the calculations of dilution above. 
During the current fiscal year, we adopted a new accounting standard which changed the methodology by which we calculate our diluted weighted average shares outstanding. See "Note 8. Recent accounting pronouncements" for details of this change. 
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