Derivative Financial Instruments - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Oct. 26, 2019	Oct. 27, 2018	Oct. 26, 2019	Oct. 27, 2018	Apr. 27, 2019	Mar. 25, 2015	Jan. 31, 2014
Derivative [Line Items]
Gains or losses recognized in OCI on cash flow hedging derivative			$ 0	$ 0
Ineffectiveness recorded during period		$ 0	0
Increase (decrease) in interest expense				(9,689,000)
Interest Rate Cap
Derivative [Line Items]
Derivative, Notional Amount		525,000,000		525,000,000
New Interest Rate Cap
Derivative [Line Items]
Derivative, Notional Amount		100,000,000		100,000,000
Interest Rate Swap Agreement
Derivative [Line Items]
Settlement of swap	$ 29,003,000			615,000
Interest Rate Swap Agreement | 5.17% Senior Notes
Derivative [Line Items]
Percentage of senior notes								5.17%
Derivative, Notional Amount								$ 250,000,000
Interest Rate Swap Agreement | Senior Notes 3.48%
Derivative [Line Items]
Percentage of senior notes							3.48%
Aggregate principal amount							$ 250,000,000
Interest Rate Swap
Derivative [Line Items]
Increase (decrease) in interest expense		(725,000)	$ (725,000)	(1,450,000)	$ (1,458,000)
Derivative, Notional Amount		520,060,000		520,060,000		$ 553,719,000
Interest Rate Swap Two
Derivative [Line Items]
Derivative, Notional Amount		$ 94,096,000		$ 94,096,000