Derivative Financial Instruments - Additional Information (Details)	1 Months Ended		12 Months Ended
	Mar. 31, 2015 USD ($)	Mar. 31, 2008 USD ($) agreement	Apr. 28, 2018 USD ($)	Apr. 29, 2017 USD ($)	Apr. 30, 2016 USD ($)	Mar. 25, 2015 USD ($)	Jan. 31, 2014 USD ($)
Derivative [Line Items]
Hedge ineffectiveness recorded			$ 0	$ 0	$ 0
Cash flow hedge gain (loss) to be reclassified into earnings over the next twelve months			(2,908,000)
Interest Rate Cap
Derivative [Line Items]
Notional amount of derivatives			575,000,000
Interest Rate Cap, Funding II
Derivative [Line Items]
Notional amount of derivatives			100,000,000
Interest Rate Swap Agreement
Derivative [Line Items]
Notional amount of derivatives							$ 250,000,000
Number of interest rate swap agreements | agreement		2
Notional amount of derivative asset		$ 100,000,000
Increase to other comprehensive income		$ 1,000,000
Percentage of senior notes							5.17%
Settlement of swap	$ 29,003,000
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]
Derivative gains recognized in OCI			0	0	0
Derivative losses recognized in OCI			$ 0	$ 0	$ 0