Other Accrued Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 27, 2019	Jan. 26, 2019
Payables and Accruals [Abstract]
increase in accrued construction costs, Current	$ 15,000
Product Warranty Expense	8,200
Accrued payroll and related taxes	28,420	$ 25,591
Accrued employee benefit and incentive plan costs	9,475	25,482
Accrued construction costs	51,439	36,449
Other current liabilities	20,056	16,552
Total other accrued liabilities	$ 109,390	$ 104,074