Commitments and Contingencies	6 Months Ended
Jan. 24, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies In October 2012, a former employee of UtiliQuest, LLC ("UtiliQuest"), a wholly-owned subsidiary of the Company, commenced a lawsuit against UtiliQuest in the Superior Court of California. The lawsuit alleged that UtiliQuest violated the California Labor Code, the California Business & Professions Code and the Labor Code Private Attorneys General Act of 2004 by failing to pay for all hours worked (including overtime) and failing to provide meal breaks and accurate wage statements. The plaintiff sought unspecified damages and other relief on behalf of himself and a putative class of current and former employees of UtiliQuest who worked in the state of California in the four years preceding the filing date of the lawsuit. In July 2014, the plaintiff’s attorney and UtiliQuest entered into a memorandum of understanding pursuant to which the parties agreed to the terms of a proposed settlement of the lawsuit. The Company accrued $0.6 million with respect to the proposed settlement in the fourth quarter of fiscal 2014. On November 12, 2014, the Court entered an order of preliminary approval of the proposed settlement. The Court granted final approval on February 6, 2015. The Company has filed construction liens with respect to approximately $17.7 million for past due balances from a customer on a rural project funded primarily by the Rural Utilities Service agency of the United States Department of Agriculture under the American Recovery and Reinvestment Act of 2009. In April 2014, R&R Taylor Construction, Inc. ("R&R"), a construction company, filed suit against this customer alleging that the customer failed to pay for construction services and materials. In its lawsuit, the construction company seeks to foreclose on its construction lien and, ultimately, to foreclose on the parcel of land on which the lien was filed. Pauley Construction, Inc. (“Pauley”), a wholly-owned subsidiary of the Company, had performed work on this parcel as part of its work on the rural project described above. Pauley has filed a construction lien on the parcel with respect to past due accounts receivable for work performed on this project. In July 2014, R&R amended its lawsuit to include Pauley, alleging that its lien has priority over Pauley’s construction lien. Pauley has filed an answer to this amended complaint in the Montana Eighteenth Judicial District Court, a counterclaim against the construction company and a cross-claim against the customer, alleging that Pauley’s lien is superior to all other liens on such parcel of land. The customer is progressing on a plan that would include payment to vendors having construction liens, including Pauley, if the plan is completed. It is too early to evaluate the likelihood of an outcome to this matter. The Company intends to vigorously defend itself against this lawsuit as part of ongoing efforts to collect the past due amount from this customer. In November 2013, the wife of a former employee of Nichols Construction, LLC (“Nichols”), a wholly-owned subsidiary of the Company, commenced a lawsuit against Nichols in the Circuit Court of Barbour County, West Virginia. The lawsuit, which the plaintiff filed on behalf of her husband’s estate, is based upon a “deliberate intent” claim pursuant to West Virginia Code in connection with the death of her husband who was struck by a falling tree while at work. The plaintiff seeks unspecified damages and other relief. In December 2012, Nichols removed the case to the United States District Court for the Northern District of West Virginia, and in January 2015, Nichols filed a motion for summary judgment with respect to certain of the “deliberate intent” issues in the lawsuit. The District Court has not yet ruled on the motion for summary judgment. Trial is currently scheduled for April 2015. Plaintiff’s expert has estimated economic damages of up to $2.6 million, exclusive of damages for emotional distress. The Company believes that it has meritorious defenses and intends to vigorously defend itself against this lawsuit. From time to time, the Company is party to various other claims and legal proceedings. It is the opinion of management, based on information available at this time, that such other pending claims or proceedings will not have a material effect on its financial statements. Within the Company's insurance program, it retains the risk of loss, up to certain limits, for claims related to automobile liability, general liability, workers' compensation, employee group health, and damages relating to underground facility locating services, and the Company has established reserves that it believes to be adequate based on current evaluations and experience with these types of claims. For these claims, the effect on the Company's financial statements is generally limited to the amount needed to satisfy insurance deductibles or retentions. Commitments Performance Bonds and Guarantees - The Company has obligations under performance and other surety contract bonds related to certain of its customer contracts. Performance bonds generally provide the Company’s customer with the right to obtain payment and/or performance from the issuer of the bond if the Company fails to perform its contractual obligations. As of January 24, 2015 and July 26, 2014, the Company had $393.2 million and $446.8 million of outstanding performance and other surety contract bonds, respectively. There has been no material impact on the Company's financial statements as a result of customers exercising their rights under the bonds. The Company has periodically guaranteed certain obligations of its subsidiaries, including obligations in connection with obtaining state contractor licenses and leasing real property and equipment. Letters of Credit - The Company has standby letters of credit issued under its Credit Agreement as part of its insurance program. These standby letters of credit collateralize the Company’s obligations to its insurance carriers in connection with the settlement of potential claims. As of January 24, 2015 and July 26, 2014, the Company had $54.4 million and $49.4 million, respectively, of outstanding standby letters of credit issued under the Credit Agreement. Multi-Employer Benefit Plans - The Company contributes to several multi-employer defined benefit pension plans under the terms of collective bargaining agreements that cover certain employees represented by unions. The risks of participating in a multi-employer plan are different from single-employer plans in the following aspects: (a) assets contributed to the multi-employer plan by one employer may be used to provide benefits to employees of other participating employers; (b) if a participating employer stops contributing to the plan, the unfunded obligations of the plan may be inherited by the remaining participating employers; and (c) if the Company stops participating in the multi-employer plan the Company may be required to pay the plan an amount based on the underfunded status of the plan, referred to as a withdrawal liability. The Company has not incurred withdrawal liabilities related to the plans as of January 24, 2015 or July 26, 2014.

Commitments and Contingencies

In October 2012, a former employee of UtiliQuest, LLC ("UtiliQuest"), a wholly-owned subsidiary of the Company, commenced a lawsuit against UtiliQuest in the Superior Court of California. The lawsuit alleged that UtiliQuest violated the California Labor Code, the California Business & Professions Code and the Labor Code Private Attorneys General Act of 2004 by failing to pay for all hours worked (including overtime) and failing to provide meal breaks and accurate wage statements. The plaintiff sought unspecified damages and other relief on behalf of himself and a putative class of current and former employees of UtiliQuest who worked in the state of California in the four years preceding the filing date of the lawsuit. In July 2014, the plaintiff’s attorney and UtiliQuest entered into a memorandum of understanding pursuant to which the parties agreed to the terms of a proposed settlement of the lawsuit. The Company accrued $0.6 million with respect to the proposed settlement in the fourth quarter of fiscal 2014. On November 12, 2014, the Court entered an order of preliminary approval of the proposed settlement. The Court granted final approval on February 6, 2015.

The Company has filed construction liens with respect to approximately $17.7 million for past due balances from a customer on a rural project funded primarily by the Rural Utilities Service agency of the United States Department of Agriculture under the American Recovery and Reinvestment Act of 2009. In April 2014, R&R Taylor Construction, Inc. ("R&R"), a construction company, filed suit against this customer alleging that the customer failed to pay for construction services and materials. In its lawsuit, the construction company seeks to foreclose on its construction lien and, ultimately, to foreclose on the parcel of land on which the lien was filed. Pauley Construction, Inc. (“Pauley”), a wholly-owned subsidiary of the Company, had performed work on this parcel as part of its work on the rural project described above. Pauley has filed a construction lien on the parcel with respect to past due accounts receivable for work performed on this project. In July 2014, R&R amended its lawsuit to include Pauley, alleging that its lien has priority over Pauley’s construction lien. Pauley has filed an answer to this amended complaint in the Montana Eighteenth Judicial District Court, a counterclaim against the construction company and a cross-claim against the customer, alleging that Pauley’s lien is superior to all other liens on such parcel of land. The customer is progressing on a plan that would include payment to vendors having construction liens, including Pauley, if the plan is completed. It is too early to evaluate the likelihood of an outcome to this matter. The Company intends to vigorously defend itself against this lawsuit as part of ongoing efforts to collect the past due amount from this customer.

In November 2013, the wife of a former employee of Nichols Construction, LLC (“Nichols”), a wholly-owned subsidiary of the Company, commenced a lawsuit against Nichols in the Circuit Court of Barbour County, West Virginia. The lawsuit, which the plaintiff filed on behalf of her husband’s estate, is based upon a “deliberate intent” claim pursuant to West Virginia Code in connection with the death of her husband who was struck by a falling tree while at work. The plaintiff seeks unspecified damages and other relief. In December 2012, Nichols removed the case to the United States District Court for the Northern District of West Virginia, and in January 2015, Nichols filed a motion for summary judgment with respect to certain of the “deliberate intent” issues in the lawsuit. The District Court has not yet ruled on the motion for summary judgment. Trial is currently scheduled for April 2015. Plaintiff’s expert has estimated economic damages of up to $2.6 million, exclusive of damages for emotional distress. The Company believes that it has meritorious defenses and intends to vigorously defend itself against this lawsuit.

From time to time, the Company is party to various other claims and legal proceedings. It is the opinion of management, based on information available at this time, that such other pending claims or proceedings will not have a material effect on its financial statements.

Within the Company's insurance program, it retains the risk of loss, up to certain limits, for claims related to automobile liability, general liability, workers' compensation, employee group health, and damages relating to underground facility locating services, and the Company has established reserves that it believes to be adequate based on current evaluations and experience with these types of claims. For these claims, the effect on the Company's financial statements is generally limited to the amount needed to satisfy insurance deductibles or retentions.

Commitments

Performance Bonds and Guarantees - The Company has obligations under performance and other surety contract bonds related to certain of its customer contracts. Performance bonds generally provide the Company’s customer with the right to obtain payment and/or performance from the issuer of the bond if the Company fails to perform its contractual obligations. As of January 24, 2015 and July 26, 2014, the Company had $393.2 million and $446.8 million of outstanding performance and other surety contract bonds, respectively. There has been no material impact on the Company's financial statements as a result of customers exercising their rights under the bonds.

The Company has periodically guaranteed certain obligations of its subsidiaries, including obligations in connection with obtaining state contractor licenses and leasing real property and equipment.

Letters of Credit - The Company has standby letters of credit issued under its Credit Agreement as part of its insurance program. These standby letters of credit collateralize the Company’s obligations to its insurance carriers in connection with the settlement of potential claims. As of January 24, 2015 and July 26, 2014, the Company had $54.4 million and $49.4 million, respectively, of outstanding standby letters of credit issued under the Credit Agreement.

Multi-Employer Benefit Plans - The Company contributes to several multi-employer defined benefit pension plans under the terms of collective bargaining agreements that cover certain employees represented by unions. The risks of participating in a multi-employer plan are different from single-employer plans in the following aspects: (a) assets contributed to the multi-employer plan by one employer may be used to provide benefits to employees of other participating employers; (b) if a participating employer stops contributing to the plan, the unfunded obligations of the plan may be inherited by the remaining participating employers; and (c) if the Company stops participating in the multi-employer plan the Company may be required to pay the plan an amount based on the underfunded status of the plan, referred to as a withdrawal liability. The Company has not incurred withdrawal liabilities related to the plans as of January 24, 2015 or July 26, 2014.