Concentration of Credit Risk (Tables)

9 Months Ended

Apr. 25, 2015

Risks and Uncertainties [Abstract]

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

Customers whose revenues exceeded 10% of total revenue during the three or nine months ended April 25, 2015 or April 26, 2014 were as follows:

	For the Three Months Ended		For the Nine Months Ended
	April 25, 2015	April 26, 2014	April 25, 2015	April 26, 2014
AT&T Inc.	21.3%	20.8%	21.5%	18.9%
CenturyLink, Inc.	13.9%	12.8%	13.7%	14.3%
Comcast Corporation	13.3%	12.1%	13.0%	11.5%

Schedule of Customers Representing 10% or More of Combined Amounts of Trade Accounts Receivable and Costs and Estimated Earnings in Excess of Billings with the Following Outstanding Balances and Related Percentages of the Company’s Total Outstanding Balances

Customers representing 10% or more of combined amounts of trade accounts receivable and costs and estimated earnings in excess of billings, net ("CIEB, net") as of April 25, 2015 or July 26, 2014 had the following outstanding balances and the related percentage of the Company’s total outstanding balances:

	April 25, 2015				July 26, 2014
	Amount		% of Total		Amount		% of Total
			(Dollars in millions)
AT&T Inc.	$	103.5	20.7	%	$	87.6	17.9	%
CenturyLink, Inc.	$	56.2	11.2	%	$	48.2	9.8	%
Comcast Corporation	$	55.5	11.1	%	$	48.9	9.9	%