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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 29, 2022
Jul. 31, 2021
Jan. 23, 2021
Jan. 29, 2022
Jan. 23, 2021
Oct. 30, 2021
Apr. 24, 2021
Schedule of Investments [Line Items]              
Gains on investments $ 13,092   $ 0 $ 100,919 $ 0    
Estimated fair value of debt 498,771     498,771     $ 610,811
Carrying value of debt 488,353     488,353     588,295
Vetsource              
Schedule of Investments [Line Items]              
Carrying value of investment 56,849 $ 25,814   56,849     25,814
Proceeds from sale of investment   56,849          
Gain on sale of investment   31,035          
Noncash gain on investments   31,035          
Gain on investment put option   $ 25,757          
Gains on investments 87,827            
Carrying value, put option 25,757     25,757      
Vets Plus              
Schedule of Investments [Line Items]              
Carrying value of investment 2,355     $ 2,355   $ 4,009,000 $ 2,355
Proceeds from sale of investment 17,101            
Gains on investments $ 13,092