Other Accrued Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 27, 2019	Jan. 26, 2019
Payables and Accruals [Abstract]
increase in accrued construction costs, Current	$ 13,700
Product Warranty Expense	10,500
Accrued payroll and related taxes	30,042	$ 25,591
Accrued employee benefit and incentive plan costs	15,985	25,482
Accrued construction costs	50,175	36,449
Other current liabilities	20,957	16,552
Total other accrued liabilities	$ 117,159	$ 104,074