Employee Benefits	12 Months Ended
Aug. 31, 2015
General Discussion of Pension and Other Postretirement Benefits [Abstract]
Employee Benefits	Employee Benefits The Company and certain of its subsidiaries have qualified and nonqualified retirement plans covering substantially all employees. These plans include a defined benefit pension plan, a supplemental executive retirement benefit plan (“SERBP”), multiemployer pension plans and defined contribution plans. Defined Benefit Pension Plan and Supplemental Executive Retirement Benefit Plan The Company maintains a qualified defined benefit pension plan for certain nonunion employees. Effective June 30, 2006, the Company froze this plan and ceased accruing further benefits for employee service. The Company reflects the funded status of the defined benefit pension plan as a net asset or liability in its Consolidated Balance Sheets. Changes in its funded status are recognized in comprehensive income (loss). The Company amortizes as a component of net periodic pension benefit cost a portion of the net gain or loss reported within accumulated other comprehensive loss if the beginning-of-year net gain or loss exceeds 5% of the greater of the benefit obligation or the market value of plan assets. Net periodic pension benefit cost was not material for the years ended August 31, 2015, 2014 and 2013. The fair value of the plan assets was $15 million and $18 million as of August 31, 2015 and 2014, respectively, and the projected benefit obligation was $13 million and $14 million as of August 31, 2015 and 2014, respectively. The plan was fully funded with the plan assets exceeding the projected benefit obligation by $2 million and $4 million as of August 31, 2015 and 2014, respectively. Plan assets were comprised entirely of Level 1 investments as of August 31, 2015 and 2014. Level 1 investments are valued based on quoted market prices of identical securities in the principal market. No contributions are expected to be made to the defined benefit pension plan in the future; however, changes in the discount rate or actual investment returns that are lower than the long-term expected return on plan assets could result in the need for the Company to make additional contributions. The assumed discount rate used to calculate the projected benefit obligations was 4.10% and 4.05% as of August 31, 2015 and 2014, respectively. The Company estimates future annual benefit payments to be between $1 million and $3 million per year. The Company also has a nonqualified SERBP for certain executives. A restricted trust fund has been established with assets invested in life insurance policies that can be used for plan benefits, although the fund is subject to claims of the Company’s general creditors. The trust fund is included in other assets and the pension liability is included in other long-term liabilities in the Company’s Consolidated Balance Sheets. The trust fund is valued at $3 million as of August 31, 2015 and 2014. The trust fund assets’ gains and losses are included in other income, net in the Company’s Consolidated Statements of Operations. The benefit obligation and the unfunded amount were $4 million as of August 31, 2015 and 2014. Net periodic pension cost under the SERBP was not material for the years ended August 31, 2015, 2014 and 2013. Because the defined benefit pension plan and the SERBP are not material to the Consolidated Financial Statements, other disclosures required by U.S. GAAP have been omitted. Multiemployer Pension Plans The Company contributes to 13 multiemployer pension plans in accordance with its collective bargaining agreements. Multiemployer pension plans are defined benefit plans sponsored by multiple employers in accordance with one or more collective bargaining agreements. The plans are jointly managed by trustees that include representatives from both management and labor unions. Contributions to the plans are made based upon a fixed rate per hour worked and are agreed to by contributing employers and the unions in collective bargaining. Benefit levels are set by a joint board of trustees based on the advice of an independent actuary regarding the level of benefits that agreed-upon contributions can be expected to support. To the extent that the pension obligation of other participating employers is unfunded, the Company may be required to make additional contributions in the future to fund these obligations. One of the multiemployer plans that the Company contributes to is the Steelworkers Western Independent Shops Pension Plan (“WISPP”, EIN 90-0169564, Plan No. 001) benefiting the union employees of SMB, which are covered by a collective bargaining agreement that will expire on March 31, 2016. As of October 1, 2012, the WISPP had an accumulated funding deficiency (i.e., a failure to satisfy the minimum funding requirements) and was certified in a Red Zone Status, as defined by the Pension Protection Act of 2006. As of October 1, 2013, the WISPP was no longer in Red Zone Status, having been certified by the plan’s actuaries as being in the Green Zone. The Company contributed $3 million to the WISPP for each of the years ended August 31, 2015, 2014 and 2013. These contributions represented more than 5% of total contributions to the WISPP for each year. In 2004, the Internal Revenue Service (“IRS”) approved a seven-year extension of the period over which the WISPP may amortize unfunded liabilities, conditioned upon maintenance of certain minimum funding levels. In 2014, the WISPP obtained relief from the specified funding requirements from the IRS, without which the IRS could have revoked the amortization extension retroactively to the 2002 plan year resulting in a material liability for the Company’s share of the resulting funding deficiency. Based on the actuarial valuation for the WISPP as of October 1, 2014, the funded percentage (based on the ratio of the market value of assets to the accumulated benefits liability (present value of accrued benefits) using the valuation method prescribed by the IRS) was 78.2%, which is above the minimum funded ratio specified in the funding relief agreement with the IRS. Company contributions to all of the multiemployer plans were $4 million for the years ended August 31, 2015, 2014 and 2013. Defined Contribution Plans The Company has several defined contribution plans covering certain employees. Company contributions to the defined contribution plans totaled $3 million for the year ended August 31, 2015 and $2 million for each of the years ended August 31, 2014 and 2013.

Employee Benefits

The Company and certain of its subsidiaries have qualified and nonqualified retirement plans covering substantially all employees. These plans include a defined benefit pension plan, a supplemental executive retirement benefit plan (“SERBP”), multiemployer pension plans and defined contribution plans.

Defined Benefit Pension Plan and Supplemental Executive Retirement Benefit Plan

The Company maintains a qualified defined benefit pension plan for certain nonunion employees. Effective June 30, 2006, the Company froze this plan and ceased accruing further benefits for employee service. The Company reflects the funded status of the defined benefit pension plan as a net asset or liability in its Consolidated Balance Sheets. Changes in its funded status are recognized in comprehensive income (loss). The Company amortizes as a component of net periodic pension benefit cost a portion of the net gain or loss reported within accumulated other comprehensive loss if the beginning-of-year net gain or loss exceeds 5% of the greater of the benefit obligation or the market value of plan assets. Net periodic pension benefit cost was not material for the years ended August 31, 2015, 2014 and 2013. The fair value of the plan assets was $15 million and $18 million as of August 31, 2015 and 2014, respectively, and the projected benefit obligation was $13 million and $14 million as of August 31, 2015 and 2014, respectively. The plan was fully funded with the plan assets exceeding the projected benefit obligation by $2 million and $4 million as of August 31, 2015 and 2014, respectively. Plan assets were comprised entirely of Level 1 investments as of August 31, 2015 and 2014. Level 1 investments are valued based on quoted market prices of identical securities in the principal market. No contributions are expected to be made to the defined benefit pension plan in the future; however, changes in the discount rate or actual investment returns that are lower than the long-term expected return on plan assets could result in the need for the Company to make additional contributions. The assumed discount rate used to calculate the projected benefit obligations was 4.10% and 4.05% as of August 31, 2015 and 2014, respectively. The Company estimates future annual benefit payments to be between $1 million and $3 million per year.

The Company also has a nonqualified SERBP for certain executives. A restricted trust fund has been established with assets invested in life insurance policies that can be used for plan benefits, although the fund is subject to claims of the Company’s general creditors. The trust fund is included in other assets and the pension liability is included in other long-term liabilities in the Company’s Consolidated Balance Sheets. The trust fund is valued at $3 million as of August 31, 2015 and 2014. The trust fund assets’ gains and losses are included in other income, net in the Company’s Consolidated Statements of Operations. The benefit obligation and the unfunded amount were $4 million as of August 31, 2015 and 2014. Net periodic pension cost under the SERBP was not material for the years ended August 31, 2015, 2014 and 2013.

Because the defined benefit pension plan and the SERBP are not material to the Consolidated Financial Statements, other disclosures required by U.S. GAAP have been omitted.

Multiemployer Pension Plans

The Company contributes to 13 multiemployer pension plans in accordance with its collective bargaining agreements. Multiemployer pension plans are defined benefit plans sponsored by multiple employers in accordance with one or more collective bargaining agreements. The plans are jointly managed by trustees that include representatives from both management and labor unions. Contributions to the plans are made based upon a fixed rate per hour worked and are agreed to by contributing employers and the unions in collective bargaining. Benefit levels are set by a joint board of trustees based on the advice of an independent actuary regarding the level of benefits that agreed-upon contributions can be expected to support. To the extent that the pension obligation of other participating employers is unfunded, the Company may be required to make additional contributions in the future to fund these obligations.

One of the multiemployer plans that the Company contributes to is the Steelworkers Western Independent Shops Pension Plan (“WISPP”, EIN 90-0169564, Plan No. 001) benefiting the union employees of SMB, which are covered by a collective bargaining agreement that will expire on March 31, 2016. As of October 1, 2012, the WISPP had an accumulated funding deficiency (i.e., a failure to satisfy the minimum funding requirements) and was certified in a Red Zone Status, as defined by the Pension Protection Act of 2006. As of October 1, 2013, the WISPP was no longer in Red Zone Status, having been certified by the plan’s actuaries as being in the Green Zone. The Company contributed $3 million to the WISPP for each of the years ended August 31, 2015, 2014 and 2013. These contributions represented more than 5% of total contributions to the WISPP for each year.

In 2004, the Internal Revenue Service (“IRS”) approved a seven-year extension of the period over which the WISPP may amortize unfunded liabilities, conditioned upon maintenance of certain minimum funding levels. In 2014, the WISPP obtained relief from the specified funding requirements from the IRS, without which the IRS could have revoked the amortization extension retroactively to the 2002 plan year resulting in a material liability for the Company’s share of the resulting funding deficiency. Based on the actuarial valuation for the WISPP as of October 1, 2014, the funded percentage (based on the ratio of the market value of assets to the accumulated benefits liability (present value of accrued benefits) using the valuation method prescribed by the IRS) was 78.2%, which is above the minimum funded ratio specified in the funding relief agreement with the IRS.

Company contributions to all of the multiemployer plans were $4 million for the years ended August 31, 2015, 2014 and 2013.

Defined Contribution Plans

The Company has several defined contribution plans covering certain employees. Company contributions to the defined contribution plans totaled $3 million for the year ended August 31, 2015 and $2 million for each of the years ended August 31, 2014 and 2013.