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Condensed Consolidated Statement of Stockholders' Equity - 6 months ended Mar. 31, 2017 - USD ($) $ in Millions | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member]
--- | --- | --- | --- | --- | --- | ---
Balances as of beginning of period at Sep. 30, 2016 | $ 433.8 | $ 0.2 | $ (46.3) | $ 249.4 | $ 255.1 | $ (24.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 17.3 |  |  |  | 17.3 |
Other comprehensive loss | (0.2) |  |  |  |  | (0.2)
Exercise of stock options | 2.2 |  |  | 2.2 |  |
Share-based Compensation | 2.6 |  |  | 2.6 |  |
Balances as of end of period at Mar. 31, 2017 | $ 455.7 | $ 0.2 | $ (46.3) | $ 254.2 | $ 272.4 | $ (24.8)

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