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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 28, 2023
Jan. 29, 2022
Jul. 31, 2021
Jan. 28, 2023
Jan. 29, 2022
Apr. 30, 2022
Schedule of Investments [Line Items]            
Gains on investments $ 0 $ 13,092   $ 0 $ 100,919  
Estimated fair value of debt 483,606     483,606   $ 489,777
Carrying value of debt 487,910     487,910   488,554
Vetsource            
Schedule of Investments [Line Items]            
Carrying value of investment 56,849   $ 25,814 56,849   $ 56,849
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      
Carrying value, put option $ 25,757     25,757    
Gains on investments       $ 87,827