Rendering

Component: (Network and Table)
Network
158 - Disclosure - Weighted Average Assumptions Used to Estimate Fair Value Each Option (Detail)
(http://www.amsoftware.com/taxonomy/role/DisclosureWeightedAverageAssumptionsUsedToEstimateFairValueEachOption)
TableSchedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000713425 (http://www.sec.gov/CIK)
Legal Entity [Axis]Entity [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]Period [Axis]
2015-05-01 - 2016-04-30
2014-05-01 - 2015-04-30
2013-05-01 - 2014-04-30
Dividend yield
.049  
.040  
.040  
Expected volatility
.336  
.345  
.476  
Risk-free interest rate
.015  
.017  
.015  
Expected term
P5Y  
P5Y  
P5Y