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1055 - Disclosure - Fair Value of Option Granted Valuation Assumption (Detail)
(http://www.analogic.com/taxonomy/role/DisclosureFairValueOfOptionGrantedValuationAssumption)
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]0000006284 (http://www.sec.gov/CIK)
Legal Entity [Axis]Entity [Domain]
Schedule of Share-based Compensation Arrangement by Share-based Payment AwardStock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]Period [Axis]
2014-08-01 - 2015-07-31
2013-08-01 - 2014-07-31
Expected option term in years
P5Y3M22D 1
P5Y4M13D 1
Expected volatility
.293 2
.386 2
Risk-free interest rate
.0182 3
.0177 3
Expected annual dividend yield
.0056 4
.0052 4
Weighted average grant date fair value
19.95  
27.55  
1: The expected option term was estimated using historical data.
2: The expected volatility for each grant is determined based on the review of the average of historical daily price changes of our common stock over the expected option term.
3: The risk-free interest rate is determined based on the yield of zero-coupon U.S. Treasury securities for a period that is commensurate with the expected term assumption.
4: The expected annual dividend yield is calculated by dividing the expected annual dividends by the stock price on the date of grant.