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Earnings per share (Tables) | 12 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Schedule of the components of basic and diluted earnings per share | The weighted average number of shares outstanding used to compute earnings per share was as follows (in thousands):
| Year ended September 30,
| 2018 |  | 2017 |  | 2016
Weighted average shares outstanding | 65,501 |  |  | 65,632 |  |  | 65,822 |
Effect of employee stock options and unvested restricted stock awards | 431 |  |  | 433 |  |  | 407 |
Denominator for diluted earnings per share | 65,932 |  |  | 66,065 |  |  | 66,229 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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