Concentration of Credit Risk (Tables)

6 Months Ended

Jan. 28, 2017

Schedule that Represents A Significant Portion of the Company’s Customer Base and Each Over 10% of Total Revenue

Customers whose contract revenues exceeded 10% of total contract revenues during the 2018 transition period or fiscal 2017, 2016, or 2015 were as follows:



	Six Months Ended	Fiscal Year Ended
	January 27, 2018	July 29, 2017	July 30, 2016	July 25, 2015
Comcast Corporation	21.6%	17.7%	13.6%	12.9%
AT&T Inc.	20.6%	26.3%	24.4%	20.8%
CenturyLink, Inc.⁽¹⁾	17.5%	18.2%	14.7%	14.5%
Verizon Communications Inc.⁽²⁾	12.0%	9.2%	11.2%	7.7%

Customers whose combined amounts of trade accounts receivable and costs and estimated earnings in excess of billings, net (“CIEB, net”) exceeded 10% of total combined trade receivables and CIEB, net as of January 27, 2018, July 29, 2017, or July 30, 2016 were as follows (dollars in millions):



	January 27, 2018			July 29, 2017			July 30, 2016
	Amount		% of Total	Amount		% of Total	Amount		% of Total
Comcast Corporation	$	166.5	24.5%	$	159.7	21.3%	$	95.3	13.9%
CenturyLink, Inc.⁽¹⁾	$	126.0	18.5%	$	148.1	19.8%	$	81.5	11.9%
Verizon Communications Inc.⁽²⁾	$	98.2	14.4%	$	73.7	9.8%	$	70.2	10.2%
AT&T Inc.	$	79.2	11.6%	$	87.1	11.6%	$	138.8	20.3%
Windstream Corporation	$	42.9	6.3%	$	84.7	11.3%	$	79.0	11.5%