Commitments and Contingencies - Schedule of Purchase Commitments (Details) (USD $) In Thousands, unless otherwise specified	Jan. 25, 2015
Purchase Commitments [Line Items]
Purchase obligation due within one year	$ 33,108
Purchase obligations due in second and third year	3,446
Total	36,554
Open capital purchase commitments
Purchase Commitments [Line Items]
Purchase obligation due within one year	4,044
Purchase obligations due in second and third year	0
Total	4,044
Other open purchase commitments
Purchase Commitments [Line Items]
Purchase obligation due within one year	28,064
Purchase obligations due in second and third year	3,446
Total	31,510
Other vendor commitments
Purchase Commitments [Line Items]
Purchase obligation due within one year	1,000
Purchase obligations due in second and third year	0
Total	$ 1,000