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Subsequent Event (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Mar. 20, 2017
Jan. 31, 2018
Apr. 30, 2017
Scenario, Forecast      
Subsequent Event [Line Items]      
Expected pre-tax cost savings to be realized   $ 12.0  
Scenario, Forecast | Minimum      
Subsequent Event [Line Items]      
Pre-tax charge in connection with completion of cost saving initiatives     $ 7.0
Scenario, Forecast | Maximum      
Subsequent Event [Line Items]      
Pre-tax charge in connection with completion of cost saving initiatives     $ 10.0
Subsequent Event      
Subsequent Event [Line Items]      
Expected annualized pre-tax cost savings $ 15.0