Quarterly report pursuant to Section 13 or 15(d)

Contingencies (Details)

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Contingencies (Details) - USD ($)
$ in Millions
9 Months Ended
Feb. 02, 2019
Apr. 30, 2020
Feb. 05, 2020
Apr. 16, 2019
Feb. 05, 2019
Commitments and Contingencies Disclosure [Abstract]          
Equity Method Investment, Ownership Percentage     80.00%    
Settlement agreement   $ 0.8      
Settlement amount   $ 0.8      
Other Commitment         $ 21.0
Attorney contingency payments       $ 9.5 $ 19.4
Description of one-time payments The terms of the agreement include one-time payments totaling $14 million to the Company in exchange for fully paid-up, worldwide licenses to Hologic and Grifols.