Concentration of Credit Risk

3 Months Ended

Oct. 29, 2011

Concentration of Credit Risk [Abstract]

Concentration of Credit Risk

17. Concentration of Credit Risk

The Company's customer base is highly concentrated, with the current top five customers as of the three months ended October 29, 2011 accounting for approximately 59.9% and 60.0% of its total revenues for the three months ended October 29, 2011 and October 30, 2010, respectively. AT&T Inc. ("AT&T"), CenturyLink, Inc. ("CenturyLink"), Comcast Corporation ("Comcast"), and Verizon Communications, Inc. ("Verizon") represent a significant portion of the Company's customer base and were over 10% or more of total revenue during the three months ended October 29, 2011 or October 30, 2010 as reflected in the following table:

	For the Three Months Ended
	October 29, 2011	October 30, 2010
AT&T	15.2%	23.2%
CenturyLink*	13.3%	9.2%
Comcast	12.9%	15.6%
Verizon	12.0%	8.0%

*For comparison purposes, revenues from CenturyLink, Inc. and Qwest Communications International, Inc. have been combined for periods prior to their April 2011 merger.

The Company believes that none of its significant customers were experiencing financial difficulties which would materially impact the collectability of the Company's trade accounts receivable and costs in excess of billings as of October 29, 2011. Customers representing 10% or more of combined amounts of trade accounts receivable and costs and estimated earnings in excess of billings as of October 29, 2011 or July 30, 2011 had the following outstanding balances and the related percentage of the Company's total outstanding balances:

	October 29, 2011				July 30, 2011
	Amount		% of Total		Amount		% of Total
			(Dollars in millions)
CenturyLink	$	48.9		20.2%	$	41.4		18.0%
Verizon	$	27.8		11.5%	$	26.4		11.5%
AT&T	$	26.8		11.0%	$	29.2		12.7%
Comcast	$	24.8		10.2%	$	22.5		9.8%