Concentration of Credit Risk (Notes)

6 Months Ended

Jan. 26, 2013

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 58.2% and 59.1% of its total revenues for the six months endedJanuary 26, 2013 and January 28, 2012, 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 or six months endedJanuary 26, 2013 or January 28, 2012 as reflected in the following table:

	For the Three Months Ended		For the Six Months Ended
	January 26, 2013	January 28, 2012	January 26, 2013	January 28, 2012
CenturyLink	14.7%	14.5%	14.2%	13.9%
AT&T	13.6%	13.5%	13.5%	14.4%
Comcast	11.0%	12.5%	11.8%	12.7%
Verizon	9.1%	9.9%	9.6%	11.0%

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 January 26, 2013. Customers representing 10% or more of combined amounts of trade accounts receivable and costs and estimated earnings in excess of billings as of January 26, 2013 or July 28, 2012 had the following outstanding balances and the related percentage of the Company’s total outstanding balances:

	January 26, 2013				July 28, 2012
	Amount		% of Total		Amount		% of Total
			(Dollars in millions)
Windstream Corporation	$	54.0	14.3	%	$	35.4	13.2	%
CenturyLink	$	48.1	12.8	%	$	47.6	17.7	%
Verizon	$	26.6	7.1	%	$	30.5	11.3	%