Annual report pursuant to Section 13 and 15(d)

Financial Instruments - Fair Value of Derivative Designated as Cash Flow Hedge Instrument (Detail)

v3.19.2
Financial Instruments - Fair Value of Derivative Designated as Cash Flow Hedge Instrument (Detail) - USD ($)
$ in Thousands
Apr. 30, 2019
Apr. 30, 2018
Designated as Hedge Instrument | Interest Rate Swap    
Derivative asset:    
Interest rate swap contract $ 619 $ 2,076