XML 110 R83.htm IDEA: XBRL DOCUMENT v3.5.0.2
Retirement Plans - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2014
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions   $ 1.0 $ 0.8  
Benefits paid   1.5 0.4  
Expected benefits payments for fiscal year 2017   $ 0.3    
Defined Contribution Pension Plan 401k        
Defined Benefit Plan Disclosure [Line Items]        
Employer matching contribution percentage of employee contributions of eligible compensation   4.00%    
Company's contributions to the plan   $ 5.2 5.1 $ 5.2
Defined Contribution Pension Plan 401k | Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Percentage employees may contribute of their eligible compensation to the plan   1.00%    
Defined Contribution Pension Plan 401k | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Percentage employees may contribute of their eligible compensation to the plan   80.00%    
Analogic Canada Plan        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions   $ 1.0 0.8 1.6
Benefits paid   1.5 0.4 $ 0.9
Expected contributions for fiscal year 2017   0.0    
Expected benefits payments for fiscal year 2017   0.4    
Analogic Canada Plan | Other Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
ABO balances   $ 14.1 $ 12.3  
Analogic Canada Plan | Scenario, Forecast        
Defined Benefit Plan Disclosure [Line Items]        
Expected to be amortized, net actuarial loss $ 0.3