Concentration of Credit Risk

3 Months Ended

Oct. 29, 2016

The Company’s customer base is highly concentrated, with its top five customers during each of the three months ended October 29, 2016 and October 24, 2015 accounting for approximately 74.9% and 64.9% of its total contract revenues, respectively. Customers whose contract revenues exceeded 10% of total contract revenue during the three months ended October 29, 2016 or October 24, 2015 were as follows:



	For the Three Months Ended
	October 29, 2016	October 24, 2015
AT&T Inc.	29.0%	19.1%
CenturyLink, Inc.	15.7%	15.6%
Comcast Corporation	15.1%	12.0%

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 October 29, 2016 or July 30, 2016 were as follows (dollars in millions):



	October 29, 2016			July 30, 2016
	Amount		% of Total	Amount		% of Total
AT&T Inc.	$	183.5	22.9%	$	138.8	20.3%
Comcast Corporation	$	117.0	14.6%	$	95.3	13.9%
CenturyLink, Inc.	$	108.3	13.5%	$	79.0	11.5%
Windstream Corporation	$	90.9	11.4%	$	79.0	11.5%
Verizon Communications Inc.	$	80.1	10.0%	$	69.0	10.1%

In addition, another customer had $72.1 million, or 9.0%, as of October 29, 2016, and $71.5 million, or 10.4%, as of July 30, 2016.

The Company believes that none of its significant customers were experiencing financial difficulties that would materially impact the collectability of the Company’s trade accounts receivable and costs in excess of billings as of October 29, 2016. See Note 4, Accounts Receivable, and Note 5, Costs and Estimated Earnings in Excess of Billings, for additional information regarding the Company’s trade accounts receivable and costs and estimated earnings in excess of billings.