Rendering
| Component: (Network and Table) |
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| Network | 2418408 - Disclosure - Share-Based Compensation Plans - Assumption Used in Option Valuation Model (Details) (http://www.abm.com/role/ShareBasedCompensationPlansAssumptionUsedInOptionValuationModelDetails) |
| Table | (Implied) |
Slicers (applies to each fact value in each table cell)
| Reporting Entity [Axis] | 0000771497 (http://www.sec.gov/CIK) |
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | Period [Axis] |
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2015-11-01 - 2016-10-31 | 2014-11-01 - 2015-10-31 | 2013-11-01 - 2014-10-31 |
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Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | | | |
Expected life | P2Y1M16D 3 | P2Y1M25D 3 | P2Y1M25D 3 |
Expected stock price volatility | 19.00% 4 | 18.90% 4 | 19.00% 4 |
Risk free interest rate | 0.80% 2 | 0.80% 2 | 0.60% 2 |
Stock price (usd per share) | 38.65 1 | 30.25 1 | 26.57 1 |
1: The stock price is the closing price of our common stock on the valuation date.
2: The risk-free interest rate is based on the continuous compounded yield on U.S. Treasury Constant Maturity Rates with varying remaining terms; the yield is determined over a time period commensurate with the performance period from the grant date.
3: The expected life represents the remaining performance period of the awards.
4: The expected volatility for each grant is determined based on the historical volatility of our common stock over a period equal to the remaining term of the performance period from the date of grant for all awards.