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Stock Based Compensation - Assumptions Used To Estimate Fair Value For Stock Options Granted (Details) (USD $)
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9 Months Ended | 6 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2015
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| Incentive Equity Awards Converted From ADP Awards | ||
| Assumptions used | ||
| Risk-free interest rate | 1.10% | |
| Dividend yield | 1.10% | |
| Weighted average volatility factor | 23.90% | |
| Weighted average expected life (in years) | 3 years 4 months 24 days | |
| Weighted average fair value (in dollars) | $ 12.50 | |
| Employee Stock Option | ||
| Assumptions used | ||
| Risk-free interest rate | 1.60% | |
| Dividend yield | 1.10% | |
| Weighted average volatility factor | 25.60% | |
| Weighted average expected life (in years) | 6 years 3 months 18 days | |
| Weighted average fair value (in dollars) | $ 10.24 |