Quarterly report pursuant to Section 13 or 15(d)

Comprehensive Income (Loss) - Changes in Each Component of Accumulated Other Comprehensive Loss (Parenthetical) (Detail)

v3.21.2
Comprehensive Income (Loss) - Changes in Each Component of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Deferred Compensation and Pension Plan    
Accumulated Other Comprehensive Income Loss [Line Items]    
Tax effect on reclassification of realized net losses $ 0.1 $ 0.2