Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Jan. 25, 2020	Apr. 27, 2019
Operating Leases
Within one year	$ 76,348
After one year and within two years	66,953
After two years and within three years	55,988
After three years and within four years	44,375
After four years and within five years	37,576
After five years	95,660
Total lease payments	376,900
Less: Interest	43,856
Total lease obligations	333,044
Within one year		$ 76,508
After one year and within two years		71,544
After two years and within three years		58,763
After three years and within four years		46,541
After four years and within five years		36,082
After five years		102,782
Total lease payments		392,220
Financing Leases
Within one year	40
After one year and within two years	0
After two years and within three years	0
After three years and within four years	0
After four years and within five years	0
After five years	0
Total lease payments	40
Less: Interest	1
Total lease obligations	$ 39
Within one year		180
After one year and within two years		19
After two years and within three years		0
After three years and within four years		0
After four years and within five years		0
After five years		0
Total lease payments		$ 199