Supplemental Disclosures (Details) - USD ($) $ in Thousands	9 Months Ended
	Jan. 24, 2016	Jan. 25, 2015
Supplemental Disclosures
Net cash interest payments	$ 49,507	$ 57,300
Net income tax payments	130	151
Change in accrued purchases of property and equipment in accounts payable	5,927	$ 310
Capitalized interest	$ 411