Accounts Receivable Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 25, 2020	Jan. 25, 2020
Receivables [Abstract]
Contract assets	$ 275,001	$ 253,005
Contract liabilities	24,566	16,332
Contract assets, net	250,435	$ 236,673
Contract with Customer, Liability, Revenue Recognized	$ 8,500