Discontinued Operations - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Aug. 28, 2015	Jan. 30, 2016	Jan. 24, 2015	Jan. 30, 2016	Jan. 24, 2015	Jul. 01, 2015
Discontinued Operations and Disposal Groups [Abstract]
Consideration receivable as per definitive agreement		$ 716,886		$ 716,886		$ 715,000
Proceeds from the sale including working capital adjustment	$ 718,078
Percentage of common units obtained	10.00%
Ratio of acquirer cash inflows to cash outflows at which common units obtained begin participating in distributions	2.5
Pre-tax gain on sale		$ (1,192)	$ 0	$ 24,328	$ 0
Transition services agreement, period of involvement				24 months
Professional fees incurred with sale of Patterson Medical				$ 13,692