Concentration of Credit Risk (Notes)

3 Months Ended

Oct. 27, 2012

Risks and Uncertainties [Abstract]

Concentration of Credit Risk

Concentration of Credit Risk

The Company’s customer base is highly concentrated. The top five customers accounted for approximately 59.6% and 59.9% of its total revenues for the three months endedOctober 27, 2012 and October 29, 2011, respectively. CenturyLink, Inc. (“CenturyLink”), AT&T Inc. (“AT&T”), Comcast Corporation (“Comcast”), and Verizon Communications, Inc. (“Verizon”) represent a significant portion of the Company’s customer base and each were over 10% of total revenue during the three months endedOctober 27, 2012 or October 29, 2011 as reflected in the following table:

	For the Three Months Ended
	October 27, 2012	October 29, 2011
CenturyLink	13.7%	13.3%
AT&T	13.5%	15.2%
Comcast	12.7%	12.9%
Verizon	10.2%	12.0%

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 27, 2012. Customers representing 10% or more of combined amounts of trade accounts receivable and costs and estimated earnings in excess of billings as of October 27, 2012 or July 28, 2012 had the following outstanding balances and the related percentage of the Company’s total outstanding balances:

	October 27, 2012				July 28, 2012
	Amount		% of Total		Amount		% of Total
			(Dollars in millions)
CenturyLink	$	44.3	16.3	%	$	47.6	17.7	%
Windstream Corporation	$	35.1	12.9	%	$	35.4	13.2	%
AT&T	$	26.4	9.7	%	$	24.7	9.2	%