XML 45 R59.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Other Financial Instruments and Fair Value Measurements (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Other Financial Instruments and Fair Value Measurements (Textual) [Abstract]        
Company's Municipal bond mature in 2020 $ 0.3   $ 0.3  
Company's Municipal bond mature in 2021 1.0   1.0  
Company's Municipal bond mature in 2022 1.5   1.5  
Company's Municipal bond mature in 2023 1.0   1.0  
Company's Municipal bond mature in 2024 and beyond 27.3   27.3  
Finite-Lived Intangible Assets [Line Items]        
Other intangible assets impairment charges 52.4 $ 107.2 $ 52.4 $ 107.2
U.S. Retail Pet Foods [Member]        
Finite-Lived Intangible Assets [Line Items]        
Other intangible assets impairment charges $ 52.4 $ 107.2