Summary of Significant Accounting Policies (Policies)	3 Months Ended
Aug. 31, 2013
Principles Of Consolidation	Principles of Consolidation. The consolidated financial statements include the accounts of Texas Industries, Inc. and all subsidiaries except for a joint venture in which the Company has a 40% equity interest. The joint venture is accounted for using the equity method. Certain amounts in the prior period financial statements have been reclassified to conform to the current period presentation.
Estimates	Estimates. The preparation of financial statements and accompanying notes in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported. Actual results could differ from those estimates.
Fair Value of Financial Instruments	Fair Value of Financial Instruments. The estimated fair value of each class of financial instrument as of August 31, 2013 and May 31, 2013 approximates its carrying value except for long-term debt having fixed interest rates. The fair value of our long-term debt is estimated based on broker/dealer quoted market prices, which are level two inputs. As of August 31, 2013, the fair value of our long-term debt, including the current portion, was approximately $719.5 million compared to the carrying amount of $659.4 million. As of May 31, 2013, the fair value of our long-term debt, including the current portion, was approximately $723.2 million compared to the carrying amount of $659.8 million.
Cash And Cash Equivalents	Cash and Cash Equivalents. Investments with maturities of less than 90 days when purchased are classified as cash equivalents and consist primarily of money market funds and investment grade commercial paper issued by major corporations and financial institutions.
Receivables	Receivables. Management evaluates the ability to collect accounts receivable based on a combination of factors. A reserve for doubtful accounts is maintained based on the length of time receivables are past due or the status of a customer’s financial condition. If we are aware of a specific customer’s inability to make required payments, specific amounts are added to the reserve.
Environmental Liabilities	Environmental Liabilities. We are subject to environmental laws and regulations established by federal, state and local authorities, and make provision for the estimated costs related to compliance when it is probable that an estimable liability has been incurred.
Legal Contingencies	Legal Contingencies. We are a defendant in lawsuits which arose in the normal course of business and make provision for the estimated loss from any claim or legal proceeding when it is probable that an estimable liability has been incurred.
Inventories	Inventories. Inventories are stated at the lower of cost or market. We use the last-in, first out (“LIFO”) method to value finished products, work in process and raw material inventories, excluding natural aggregate inventories. We use the average cost method to value other inventories that include natural aggregate and parts and supplies, which includes emission allowance credits. Our natural aggregate inventory excludes volumes in excess of an average twelve-month period of actual sales.
Long-lived Assets	Long-lived Assets. Management reviews long-lived assets on a facility by facility basis for impairment whenever changes in circumstances indicate that the carrying amount of the assets may not be recoverable and would record an impairment charge if necessary. Such evaluations compare the carrying amount of an asset to future undiscounted net cash flows expected to be generated by the asset and are significantly impacted by estimates of future prices for our products, capital needs, economic trends and other factors. Estimates of future cash flows reflect Management’s belief that it operates in a cyclical industry. Property, plant and equipment is recorded at cost. Costs incurred to construct certain long-lived assets include capitalized interest which is amortized over the estimated useful life of the related asset. Interest is capitalized during the construction period of qualified assets based on the average amount of accumulated expenditures and the weighted average interest rate applicable to borrowings outstanding during the period. If accumulated expenditures exceed applicable borrowings outstanding during the period, capitalized interest is allocated to projects under construction on a pro rata basis. Provisions for depreciation are computed generally using the straight-line method. Useful lives for our primary operating facilities range from 10 to 25 years with certain cement facility structures having useful lives of 40 years. Provisions for depletion of mineral deposits are computed on the basis of the estimated quantity of recoverable raw materials. The costs of removing overburden and waste materials to access mineral deposits are referred to as stripping costs. All production phase stripping costs are recognized as costs of the inventory produced during the period the stripping costs are incurred. Maintenance and repairs are charged to expense as incurred.
Goodwill and Goodwill Impairment	Goodwill and Goodwill Impairment. Management tests goodwill for impairment annually by reporting unit in the fourth quarter of our fiscal year. Management will make optional use of the qualitative assessment provided by the accounting guidance as part of its annual testing. The accounting guidance permits an entity to first perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value. If this is concluded to be the case then Management would proceed with the quantitative impairment test using a two-step process. Otherwise, the quantitative impairment test is not required. The first step of the quantitative impairment test identifies potential impairment by comparing the fair value of a reporting unit to its carrying value including goodwill. In applying a fair-value based test, estimates are made of the expected future cash flows to be derived from the reporting unit. Similar to the review for impairment of other long-lived assets, the resulting fair value determination is significantly impacted by estimates of future prices for our products, capital needs, economic trends and other factors. If the carrying value of the reporting unit exceeds its fair value, the second step of the quantitative impairment test is performed to measure the amount of impairment loss, if any. The second step of the impairment test compares the implied fair value of the reporting unit goodwill with the carrying amount of that goodwill. If the carrying value of the reporting unit goodwill exceeds the implied fair value of the goodwill, an impairment loss is recognized in an amount equal to that excess. The implied fair value of goodwill is determined in the same manner as the amount of goodwill recognized in a business combination. Goodwill resulting from the acquisition of ready-mix operations in Texas and Louisiana and identified with our concrete operations has a carrying value of $40.6 million at both August 31, 2013 and May 31, 2013. Based on an impairment test performed as of March 31, 2013, the fair value of the reporting unit exceeds its carrying value, and therefore, no potential impairment was identified.
Income Taxes	Income Taxes. Texas Industries, Inc. (the parent company) joins in filing a consolidated return with its subsidiaries based on federal and certain state tax filing requirements. Certain subsidiaries also file separate state income tax returns. Current and deferred tax expense is allocated among the members of the group based on a stand-alone calculation of the tax of the individual member. We recognize and classify deferred income taxes using an asset and liability method, whereby deferred tax assets and liabilities are recognized based on the tax effect of temporary differences between the financial statements and the tax basis of assets and liabilities, as measured by current enacted tax rates. We calculate our current and deferred tax provision based on estimates and assumptions that could differ from the actual results reflected in income tax returns filed during the subsequent year. Adjustments based on filed returns are generally recorded in the year the tax returns are filed. The amount of income tax we pay is subject to ongoing audits by federal and state authorities which may result in proposed assessments. Our estimate of the potential outcome for any uncertain tax issue is highly judgmental. We account for these uncertain tax issues using a two-step approach to recognizing and measuring uncertain tax positions taken or expected to be taken in a tax return. The first step determines if the weight of available evidence indicates that it is more likely than not that the tax position will be sustained on audit, including resolution of any related appeals or litigation processes. The second step measures the tax benefit as the largest amount that is more than 50% likely to be realized upon ultimate settlement. We adjust reserves for our uncertain tax positions due to changing facts and circumstances, the closing of a tax audit, judicial rulings, or realization of earnings or deductions that differ from our estimates. To the extent that the final outcome of these matters differs from the amounts recorded, such differences generally will impact our provision for income taxes in the period in which such a determination is made. Our provisions for income taxes include the impact of reserve provisions and changes to reserves that are considered appropriate including related interest and penalties. Management reviews our deferred tax position and in particular our deferred tax assets whenever circumstances indicate that the assets may not be realized in the future and recognizes a valuation allowance unless such deferred tax assets were deemed more likely than not to be recoverable. The ultimate realization of these deferred tax assets is dependent upon various factors including the generation of taxable income during future periods. In determining the need for a valuation allowance, we consider such factors as historical earnings, the reversal of existing temporary differences, prior taxable income (if carryback is permitted under the tax law), prudent and feasible tax planning strategies, and future taxable income. In the event we were to determine that we would not be able to realize all or part of our net deferred tax assets in the future, an adjustment to the deferred tax assets valuation allowance would be charged to earnings in the period in which we make such a determination. If we later determine that it is more likely than not that the net deferred tax assets would be realized, we would reverse the applicable portion of the previously provided valuation allowance as an adjustment to earnings at such time.
Real Estate and Investments	Real Estate and Investments. Surplus real estate and real estate acquired for development of high quality industrial, office or multi-use parks totaled $7.1 million at August 31, 2013 and $7.3 million at May 31, 2013. Investments include life insurance contracts purchased in connection with certain of our benefit plans. The contracts, recorded at their net cash surrender value, totaled $0.4 million (net of distributions of $94.0 million plus accrued interest and fees) at August 31, 2013 and $1.1 million (net of distributions of $99.8 million plus accrued interest and fees) at May 31, 2013. We can elect to receive distributions chargeable against the cash surrender value of the policies in the form of borrowings or withdrawals or we can elect to surrender the policies and receive their net cash surrender value.
Investment in Joint Venture	Investment in Joint Venture. We own a 40% equity interest in a joint venture based in Waco, Texas that operates ready-mix plants serving the central Texas market. The day to day business operations are managed by the 60% partner in the venture. We supply cement to the joint venture. The debt of the joint venture is secured by the underlying assets of the joint venture. In addition, we have guaranteed 50% and our partner has guaranteed 100% of the debt of the joint venture. Our investment totaled $16.0 million at August 31, 2013 and $14.9 million at May 31, 2013. Our equity in income of the joint venture was $1.1 million for the three-month period ended August 31, 2013 and $0.6 million for the three-month period ended August 31, 2012.
Deferred Other Charges	Deferred Other Charges. Deferred other charges totaled $19.4 million at August 31, 2013 and $18.8 million at May 31, 2013. These balance totals include debt issuance costs of $10.6 million at August 31, 2013 and $11.1 million at May 31, 2013, that amortize over the term of the related debt.
Other Credits	Other Credits. Other credits totaled $90.0 million at August 31, 2013 and $91.2 million at May 31, 2013 and are composed primarily of liabilities related to our retirement plans, deferred compensation agreements and asset retirement obligations.
Asset Retirement Obligations	Asset Retirement Obligations. We record a liability for legal obligations associated with the retirement of our long-lived assets in the period in which it is incurred if an estimate of fair value of the obligation can be made. The discounted fair value of the obligations incurred in each period are added to the carrying amount of the associated assets and depreciated over the lives of the assets. The liability is accreted at the end of each period through a charge to operating expense. A gain or loss on settlement is recognized if the obligation is settled for other than the carrying amount of the liability. We incur legal obligations for asset retirement as part of our normal operations related to land reclamation, plant removal and Resource Conservation and Recovery Act closures. Determining the amount of an asset retirement liability requires estimating the future cost of contracting with third parties to perform the obligation. The estimate is significantly impacted by, among other considerations, management’s assumptions regarding the scope of the work required, labor costs, inflation rates, market-risk premiums and closure dates
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Income (Loss). Amounts recognized in accumulated other comprehensive loss represent adjustments related to a defined benefit retirement plan and a postretirement health benefit plan covering approximately 600 employees and retirees of our California cement subsidiary. The amounts totaled $18.3 million (net of tax benefit of $2.4 million) at August 31, 2013 and $18.4 million (net of tax benefit of $2.5 million) at May 31, 2013.
Net Sales	Net Sales. Sales are recognized when title has transferred and products are delivered. We include delivery fees in the amount we bill customers to the extent needed to recover our cost of freight and delivery. Net sales are presented as revenues and include these delivery fees.
Other Income	Other Income. Routine sales of surplus operating assets and real estate resulted in gains of $3.1 million and $2.5 million in the three-month periods ended August 31, 2013 and 2012 , respectively. In addition, other income includes earnings from a joint venture of $1.1 million and $0.6 million in the three-month periods ended August 31, 2013 and 2012, respectively.
Stock-Based Compensation	Stock-based Compensation. We have provided stock-based compensation to employees and non-employee directors in the form of non-qualified and incentive stock options, restricted stock, restricted stock units, stock appreciation rights, deferred compensation agreements and stock awards. The Company began issuing restricted stock units subject to service based only conditions for the first time to employees in the prior fiscal year. In addition, the Company issued restricted stock units subject to market and service based conditions for the first time to employees during the three-month period ended August 31, 2013. We use the Black-Scholes option-pricing model to determine the fair value of stock options granted as of the date of grant. Options with graded vesting are valued as single awards and the related compensation cost is recognized using a straight-line attribution method over the shorter of the vesting period or required service period adjusted for estimated forfeitures. We use the closing stock price on the date of grant to determine the fair value of restricted stock units subject to service based only conditions. The restricted stock units subject to service based only conditions have cliff vesting at the end of a four year term, and we valued them as a single award with the related compensation cost recognized using a straight-line method over the vesting period adjusted for estimated forfeitures. We use a Monte Carlo simulation to determine the fair value of restricted stock units subject to market and service based conditions. The restricted stock units subject to market and service based conditions have cliff vesting at the end of a four year term subject to the achievement of market conditions, and we valued them as a single award with the related compensation cost recognized using a straight-line method over the vesting period adjusted for estimated forfeitures. We use the average stock price on the date of grant to determine the fair value of stock awards and restricted stock awards granted. A liability, which is included in other credits, is recorded for deferred compensation agreements and stock awards expected to be settled in cash, based on their fair value at the end of each period until such awards are paid. See further discussion in Note 7.
Earnings Per Share	Earnings Per Share (“EPS”). Income or loss allocated to common shareholders adjusts net income or loss for the participation in earnings of unvested restricted shares outstanding. Basic weighted-average number of common shares outstanding during the period includes contingently issuable shares and excludes outstanding unvested restricted shares. Contingently issuable shares outstanding at August 31, 2013 and 2012, relate to deferred compensation agreements in which directors elected to defer their fees. The deferred compensation is denominated in shares of our common stock and issued in accordance with the terms of the agreement subsequent to retirement or separation from us. The shares are considered contingently issuable because the director has an unconditional right to the shares to be issued. Diluted weighted-average number of common shares outstanding during the period adjusts basic weighted-average shares for the dilutive effect of stock options, restricted shares, restricted share units and awards.
Recently Issued Accounting Guidance	Recently Issued Accounting Guidance. In February 2013, the Financial Accounting Standards Board issued new accounting guidance aimed at improving the reporting of reclassifications out of accumulated other comprehensive income. This new guidance requires an entity to report the effect of significant reclassifications out of accumulated other comprehensive income on the respective line items in net income if the amount being reclassified is required under U.S. GAAP to be reclassified in its entirety to net income. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety from accumulated other comprehensive income to net income in the same reporting period, an entity is required to cross-reference other disclosures required under U.S. GAAP that provide additional detail about those amounts. The new guidance became effective for us on June 1, 2013 and did not have a material effect on our consolidated financial statements.

Summary of Significant Accounting Policies (Policies)

3 Months Ended

Aug. 31, 2013

Principles of Consolidation. The consolidated financial statements include the accounts of Texas Industries, Inc. and all subsidiaries except for a joint venture in which the Company has a 40% equity interest. The joint venture is accounted for using the equity method. Certain amounts in the prior period financial statements have been reclassified to conform to the current period presentation.

Estimates

Estimates. The preparation of financial statements and accompanying notes in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported. Actual results could differ from those estimates.

Fair Value of Financial Instruments

Fair Value of Financial Instruments. The estimated fair value of each class of financial instrument as of August 31, 2013 and May 31, 2013 approximates its carrying value except for long-term debt having fixed interest rates. The fair value of our long-term debt is estimated based on broker/dealer quoted market prices, which are level two inputs. As of August 31, 2013, the fair value of our long-term debt, including the current portion, was approximately $719.5 million compared to the carrying amount of $659.4 million. As of May 31, 2013, the fair value of our long-term debt, including the current portion, was approximately $723.2 million compared to the carrying amount of $659.8 million.

Cash And Cash Equivalents

Cash and Cash Equivalents. Investments with maturities of less than 90 days when purchased are classified as cash equivalents and consist primarily of money market funds and investment grade commercial paper issued by major corporations and financial institutions.

Receivables

Receivables. Management evaluates the ability to collect accounts receivable based on a combination of factors. A reserve for doubtful accounts is maintained based on the length of time receivables are past due or the status of a customer’s financial condition. If we are aware of a specific customer’s inability to make required payments, specific amounts are added to the reserve.

Environmental Liabilities

Environmental Liabilities. We are subject to environmental laws and regulations established by federal, state and local authorities, and make provision for the estimated costs related to compliance when it is probable that an estimable liability has been incurred.

Legal Contingencies

Legal Contingencies. We are a defendant in lawsuits which arose in the normal course of business and make provision for the estimated loss from any claim or legal proceeding when it is probable that an estimable liability has been incurred.

Inventories

Inventories. Inventories are stated at the lower of cost or market. We use the last-in, first out (“LIFO”) method to value finished products, work in process and raw material inventories, excluding natural aggregate inventories. We use the average cost method to value other inventories that include natural aggregate and parts and supplies, which includes emission allowance credits. Our natural aggregate inventory excludes volumes in excess of an average twelve-month period of actual sales.

Long-lived Assets

Long-lived Assets. Management reviews long-lived assets on a facility by facility basis for impairment whenever changes in circumstances indicate that the carrying amount of the assets may not be recoverable and would record an impairment charge if necessary. Such evaluations compare the carrying amount of an asset to future undiscounted net cash flows expected to be generated by the asset and are significantly impacted by estimates of future prices for our products, capital needs, economic trends and other factors. Estimates of future cash flows reflect Management’s belief that it operates in a cyclical industry.

Property, plant and equipment is recorded at cost. Costs incurred to construct certain long-lived assets include capitalized interest which is amortized over the estimated useful life of the related asset. Interest is capitalized during the construction period of qualified assets based on the average amount of accumulated expenditures and the weighted average interest rate applicable to borrowings outstanding during the period. If accumulated expenditures exceed applicable borrowings outstanding during the period, capitalized interest is allocated to projects under construction on a pro rata basis. Provisions for depreciation are computed generally using the straight-line method. Useful lives for our primary operating facilities range from 10 to 25 years with certain cement facility structures having useful lives of 40 years. Provisions for depletion of mineral deposits are computed on the basis of the estimated quantity of recoverable raw materials. The costs of removing overburden and waste materials to access mineral deposits are referred to as stripping costs. All production phase stripping costs are recognized as costs of the inventory produced during the period the stripping costs are incurred. Maintenance and repairs are charged to expense as incurred.

Goodwill and Goodwill Impairment

Goodwill and Goodwill Impairment. Management tests goodwill for impairment annually by reporting unit in the fourth quarter of our fiscal year. Management will make optional use of the qualitative assessment provided by the accounting guidance as part of its annual testing. The accounting guidance permits an entity to first perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value. If this is concluded to be the case then Management would proceed with the quantitative impairment test using a two-step process. Otherwise, the quantitative impairment test is not required.

The first step of the quantitative impairment test identifies potential impairment by comparing the fair value of a reporting unit to its carrying value including goodwill. In applying a fair-value based test, estimates are made of the expected future cash flows to be derived from the reporting unit. Similar to the review for impairment of other long-lived assets, the resulting fair value determination is significantly impacted by estimates of future prices for our products, capital needs, economic trends and other factors. If the carrying value of the reporting unit exceeds its fair value, the second step of the quantitative impairment test is performed to measure the amount of impairment loss, if any. The second step of the impairment test compares the implied fair value of the reporting unit goodwill with the carrying amount of that goodwill. If the carrying value of the reporting unit goodwill exceeds the implied fair value of the goodwill, an impairment loss is recognized in an amount equal to that excess. The implied fair value of goodwill is determined in the same manner as the amount of goodwill recognized in a business combination.

Goodwill resulting from the acquisition of ready-mix operations in Texas and Louisiana and identified with our concrete operations has a carrying value of $40.6 million at both August 31, 2013 and May 31, 2013. Based on an impairment test performed as of March 31, 2013, the fair value of the reporting unit exceeds its carrying value, and therefore, no potential impairment was identified.

Income Taxes

Income Taxes. Texas Industries, Inc. (the parent company) joins in filing a consolidated return with its subsidiaries based on federal and certain state tax filing requirements. Certain subsidiaries also file separate state income tax returns. Current and deferred tax expense is allocated among the members of the group based on a stand-alone calculation of the tax of the individual member. We recognize and classify deferred income taxes using an asset and liability method, whereby deferred tax assets and liabilities are recognized based on the tax effect of temporary differences between the financial statements and the tax basis of assets and liabilities, as measured by current enacted tax rates.

We calculate our current and deferred tax provision based on estimates and assumptions that could differ from the actual results reflected in income tax returns filed during the subsequent year. Adjustments based on filed returns are generally recorded in the year the tax returns are filed.

The amount of income tax we pay is subject to ongoing audits by federal and state authorities which may result in proposed assessments. Our estimate of the potential outcome for any uncertain tax issue is highly judgmental. We account for these uncertain tax issues using a two-step approach to recognizing and measuring uncertain tax positions taken or expected to be taken in a tax return. The first step determines if the weight of available evidence indicates that it is more likely than not that the tax position will be sustained on audit, including resolution of any related appeals or litigation processes. The second step measures the tax benefit as the largest amount that is more than 50% likely to be realized upon ultimate settlement. We adjust reserves for our uncertain tax positions due to changing facts and circumstances, the closing of a tax audit, judicial rulings, or realization of earnings or deductions that differ from our estimates. To the extent that the final outcome of these matters differs from the amounts recorded, such differences generally will impact our provision for income taxes in the period in which such a determination is made. Our provisions for income taxes include the impact of reserve provisions and changes to reserves that are considered appropriate including related interest and penalties.

Management reviews our deferred tax position and in particular our deferred tax assets whenever circumstances indicate that the assets may not be realized in the future and recognizes a valuation allowance unless such deferred tax assets were deemed more likely than not to be recoverable. The ultimate realization of these deferred tax assets is dependent upon various factors including the generation of taxable income during future periods. In determining the need for a valuation allowance, we consider such factors as historical earnings, the reversal of existing temporary differences, prior taxable income (if carryback is permitted under the tax law), prudent and feasible tax planning strategies, and future taxable income. In the event we were to determine that we would not be able to realize all or part of our net deferred tax assets in the future, an adjustment to the deferred tax assets valuation allowance would be charged to earnings in the period in which we make such a determination. If we later determine that it is more likely than not that the net deferred tax assets would be realized, we would reverse the applicable portion of the previously provided valuation allowance as an adjustment to earnings at such time.

Real Estate and Investments

Real Estate and Investments. Surplus real estate and real estate acquired for development of high quality industrial, office or multi-use parks totaled $7.1 million at August 31, 2013 and $7.3 million at May 31, 2013.

Investments include life insurance contracts purchased in connection with certain of our benefit plans. The contracts, recorded at their net cash surrender value, totaled $0.4 million (net of distributions of $94.0 million plus accrued interest and fees) at August 31, 2013 and $1.1 million (net of distributions of $99.8 million plus accrued interest and fees) at May 31, 2013. We can elect to receive distributions chargeable against the cash surrender value of the policies in the form of borrowings or withdrawals or we can elect to surrender the policies and receive their net cash surrender value.

Investment in Joint Venture

Investment in Joint Venture. We own a 40% equity interest in a joint venture based in Waco, Texas that operates ready-mix plants serving the central Texas market. The day to day business operations are managed by the 60% partner in the venture. We supply cement to the joint venture. The debt of the joint venture is secured by the underlying assets of the joint venture. In addition, we have guaranteed 50% and our partner has guaranteed 100% of the debt of the joint venture. Our investment totaled $16.0 million at August 31, 2013 and $14.9 million at May 31, 2013. Our equity in income of the joint venture was $1.1 million for the three-month period ended August 31, 2013 and $0.6 million for the three-month period ended August 31, 2012.

Deferred Other Charges

Deferred Other Charges. Deferred other charges totaled $19.4 million at August 31, 2013 and $18.8 million at May 31, 2013. These balance totals include debt issuance costs of $10.6 million at August 31, 2013 and $11.1 million at May 31, 2013, that amortize over the term of the related debt.

Other Credits

Other Credits. Other credits totaled $90.0 million at August 31, 2013 and $91.2 million at May 31, 2013 and are composed primarily of liabilities related to our retirement plans, deferred compensation agreements and asset retirement obligations.

Asset Retirement Obligations

Asset Retirement Obligations. We record a liability for legal obligations associated with the retirement of our long-lived assets in the period in which it is incurred if an estimate of fair value of the obligation can be made. The discounted fair value of the obligations incurred in each period are added to the carrying amount of the associated assets and depreciated over the lives of the assets. The liability is accreted at the end of each period through a charge to operating expense. A gain or loss on settlement is recognized if the obligation is settled for other than the carrying amount of the liability.

We incur legal obligations for asset retirement as part of our normal operations related to land reclamation, plant removal and Resource Conservation and Recovery Act closures. Determining the amount of an asset retirement liability requires estimating the future cost of contracting with third parties to perform the obligation. The estimate is significantly impacted by, among other considerations, management’s assumptions regarding the scope of the work required, labor costs, inflation rates, market-risk premiums and closure dates

Accumulated Other Comprehensive Loss

Accumulated Other Comprehensive Income (Loss). Amounts recognized in accumulated other comprehensive loss represent adjustments related to a defined benefit retirement plan and a postretirement health benefit plan covering approximately 600 employees and retirees of our California cement subsidiary. The amounts totaled $18.3 million (net of tax benefit of $2.4 million) at August 31, 2013 and $18.4 million (net of tax benefit of $2.5 million) at May 31, 2013.

Net Sales

Net Sales. Sales are recognized when title has transferred and products are delivered. We include delivery fees in the amount we bill customers to the extent needed to recover our cost of freight and delivery. Net sales are presented as revenues and include these delivery fees.

Other Income

Other Income. Routine sales of surplus operating assets and real estate resulted in gains of $3.1 million and $2.5 million in the three-month periods ended August 31, 2013 and 2012 , respectively. In addition, other income includes earnings from a joint venture of $1.1 million and $0.6 million in the three-month periods ended August 31, 2013 and 2012, respectively.

Stock-Based Compensation

Stock-based Compensation. We have provided stock-based compensation to employees and non-employee directors in the form of non-qualified and incentive stock options, restricted stock, restricted stock units, stock appreciation rights, deferred compensation agreements and stock awards. The Company began issuing restricted stock units subject to service based only conditions for the first time to employees in the prior fiscal year. In addition, the Company issued restricted stock units subject to market and service based conditions for the first time to employees during the three-month period ended August 31, 2013.

We use the Black-Scholes option-pricing model to determine the fair value of stock options granted as of the date of grant. Options with graded vesting are valued as single awards and the related compensation cost is recognized using a straight-line attribution method over the shorter of the vesting period or required service period adjusted for estimated forfeitures.

We use the closing stock price on the date of grant to determine the fair value of restricted stock units subject to service based only conditions. The restricted stock units subject to service based only conditions have cliff vesting at the end of a four year term, and we valued them as a single award with the related compensation cost recognized using a straight-line method over the vesting period adjusted for estimated forfeitures.

We use a Monte Carlo simulation to determine the fair value of restricted stock units subject to market and service based conditions. The restricted stock units subject to market and service based conditions have cliff vesting at the end of a four year term subject to the achievement of market conditions, and we valued them as a single award with the related compensation cost recognized using a straight-line method over the vesting period adjusted for estimated forfeitures.

We use the average stock price on the date of grant to determine the fair value of stock awards and restricted stock awards granted. A liability, which is included in other credits, is recorded for deferred compensation agreements and stock awards expected to be settled in cash, based on their fair value at the end of each period until such awards are paid. See further discussion in Note 7.

Earnings Per Share

Earnings Per Share (“EPS”). Income or loss allocated to common shareholders adjusts net income or loss for the participation in earnings of unvested restricted shares outstanding.

Basic weighted-average number of common shares outstanding during the period includes contingently issuable shares and excludes outstanding unvested restricted shares. Contingently issuable shares outstanding at August 31, 2013 and 2012, relate to deferred compensation agreements in which directors elected to defer their fees. The deferred compensation is denominated in shares of our common stock and issued in accordance with the terms of the agreement subsequent to retirement or separation from us. The shares are considered contingently issuable because the director has an unconditional right to the shares to be issued.

Diluted weighted-average number of common shares outstanding during the period adjusts basic weighted-average shares for the dilutive effect of stock options, restricted shares, restricted share units and awards.

Recently Issued Accounting Guidance

Recently Issued Accounting Guidance. In February 2013, the Financial Accounting Standards Board issued new accounting guidance aimed at improving the reporting of reclassifications out of accumulated other comprehensive income. This new guidance requires an entity to report the effect of significant reclassifications out of accumulated other comprehensive income on the respective line items in net income if the amount being reclassified is required under U.S. GAAP to be reclassified in its entirety to net income. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety from accumulated other comprehensive income to net income in the same reporting period, an entity is required to cross-reference other disclosures required under U.S. GAAP that provide additional detail about those amounts. The new guidance became effective for us on June 1, 2013 and did not have a material effect on our consolidated financial statements.