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Accounts Receivable (Details) - USD ($) $ in Thousands	Apr. 27, 2019	Jan. 26, 2019	Apr. 28, 2018	Jan. 27, 2018
Receivables [Abstract]
Contract with Customer, Asset, Net	$ 284,815	$ 200,724
Trade accounts receivable	299,572	331,903
Unbilled accounts receivable	393,198	283,463
Retainage	10,124	10,831
Total	702,894	626,197
Less: allowance for doubtful accounts	(1,372)	(17,702)	$ (976)	$ (998)
Allowance for Doubtful Accounts Receivable, Current		939
Accounts receivable, net	$ 701,500	$ 625,300

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Contract Receivable Retainage and Other Receivables

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For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

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For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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