Employee Benefits	12 Months Ended
Aug. 31, 2013
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. 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). Net periodic pension benefit cost was not material for the years ended August 31, 2013, 2012 and 2011. The fair value of the plan assets was $17 million as of August 31, 2013 and 2012, and the projected benefit obligation was $15 million and $18 million as of August 31, 2013 and 2012, respectively. The plan was fully funded with the plan assets exceeding the projected benefit obligation by $3 million as of August 31, 2013 and underfunded with the projected benefit obligation exceeding the plan assets by $1 million as of August 31, 2012. Plan assets were comprised of $17 million of Level 1 investments as of August 31, 2013 and $16 million of Level 1 investments and $1 million of Level 2 investments as of August 31, 2012. Level 1 investments are valued based on quoted market prices of identical securities in the principal market. Level 2 investments are valued at the net asset value of the fund which is provided by the fund’s manager and independent administrator. 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 4.73% and 3.67% as of August 31, 2013 and 2012, 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 $2 million as of August 31, 2013 and 2012. 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 $3 million and $4 million as of August 31, 2013 and 2012, respectively. Net periodic cost under the SERBP was not material for the years ended August 31, 2013, 2012 and 2011. 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. The WISPP had a certified zone status, as required by the Pension Protection Act of 2006, of Red for the plan’s year-end at September 30, 2012 and 2011, respectively. The zone status is based on information the Company received from the plan’s administrator and is certified by the plan’s actuary. The WISPP is considered to be in the Red Zone because there was a projected deficiency in the funding standard account within one year. The WISPP did not utilize any extended amortization provisions in its calculation of zone status. As a result of being in Red Zone Status, the WISPP has adopted a rehabilitation plan which requires annual contribution rate increases of 6%. The rehabilitation plan was adopted by all contributing employers. The Company was not required to pay a surcharge to the WISPP. The Company contributed $3 million to the WISPP for the year ended August 31, 2013, and $2 million for each of the years ended August 31, 2012 and 2011. 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. Based on the actuarial valuation for the WISPP as of October 1, 2012, 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 72.3%, which is below the targeted funding ratio specified in the agreement with the IRS. As a result, the WISPP is in the process of seeking relief from the specified funding requirement from the IRS. If the WISPP cannot obtain relief, revocation by the IRS of the amortization extension retroactively to the 2002 plan year could occur and result in a material liability for the Company’s share of the resulting funding deficiency, the extent of which currently cannot be estimated. Company contributions to all of the multiemployer plans were $4 million for the years ended August 31, 2013 and 2012, and $3 million for the year ended August 31, 2011. Defined Contribution Plans The Company has several defined contribution plans covering certain employees. Company contributions to the defined contribution plans totaled $2 million for the year ended August 31, 2013, and $3 million for the years ended August 31, 2012 and 2011.

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. 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). Net periodic pension benefit cost was not material for the years ended August 31, 2013, 2012 and 2011. The fair value of the plan assets was $17 million as of August 31, 2013 and 2012, and the projected benefit obligation was $15 million and $18 million as of August 31, 2013 and 2012, respectively. The plan was fully funded with the plan assets exceeding the projected benefit obligation by $3 million as of August 31, 2013 and underfunded with the projected benefit obligation exceeding the plan assets by $1 million as of August 31, 2012. Plan assets were comprised of $17 million of Level 1 investments as of August 31, 2013 and $16 million of Level 1 investments and $1 million of Level 2 investments as of August 31, 2012. Level 1 investments are valued based on quoted market prices of identical securities in the principal market. Level 2 investments are valued at the net asset value of the fund which is provided by the fund’s manager and independent administrator. 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 4.73% and 3.67% as of August 31, 2013 and 2012, 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 $2 million as of August 31, 2013 and 2012. 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 $3 million and $4 million as of August 31, 2013 and 2012, respectively. Net periodic cost under the SERBP was not material for the years ended August 31, 2013, 2012 and 2011.

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. The WISPP had a certified zone status, as required by the Pension Protection Act of 2006, of Red for the plan’s year-end at September 30, 2012 and 2011, respectively. The zone status is based on information the Company received from the plan’s administrator and is certified by the plan’s actuary. The WISPP is considered to be in the Red Zone because there was a projected deficiency in the funding standard account within one year. The WISPP did not utilize any extended amortization provisions in its calculation of zone status. As a result of being in Red Zone Status, the WISPP has adopted a rehabilitation plan which requires annual contribution rate increases of 6%. The rehabilitation plan was adopted by all contributing employers. The Company was not required to pay a surcharge to the WISPP. The Company contributed $3 million to the WISPP for the year ended August 31, 2013, and $2 million for each of the years ended August 31, 2012 and 2011. 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. Based on the actuarial valuation for the WISPP as of October 1, 2012, 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 72.3%, which is below the targeted funding ratio specified in the agreement with the IRS. As a result, the WISPP is in the process of seeking relief from the specified funding requirement from the IRS. If the WISPP cannot obtain relief, revocation by the IRS of the amortization extension retroactively to the 2002 plan year could occur and result in a material liability for the Company’s share of the resulting funding deficiency, the extent of which currently cannot be estimated.

Company contributions to all of the multiemployer plans were $4 million for the years ended August 31, 2013 and 2012, and $3 million for the year ended August 31, 2011.

Defined Contribution Plans

The Company has several defined contribution plans covering certain employees. Company contributions to the defined contribution plans totaled $2 million for the year ended August 31, 2013, and $3 million for the years ended August 31, 2012 and 2011.