Basis of Presentation (Policies)	6 Months Ended
Feb. 28, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
New Accounting Pronouncements	Recent Accounting Guidance Not Yet Adopted In February 2016, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2016-02, Leases (Topic 842). The standard requires a lessee to recognize assets and liabilities arising from an operating lease on the balance sheet. Additionally, companies are permitted to make an accounting policy election to not recognize lease assets and liabilities for leases with a term of 12 months or less. The effective date of ASU No. 2016-02 will be the first quarter of the Company’s fiscal 2020 with early adoption permitted. The Company is currently in the assessment phase and is evaluating the effect that adoption of this standard will have on its consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments. The standard replaces the incurred loss impairment methodology in current U.S. GAAP with a methodology that reflects expected credit losses on instruments within its scope, including trade receivables. This update is intended to provide financial statement users with more decision-useful information about the expected credit losses. The effective date of ASU No. 2016-13 will be the first quarter of the Company’s fiscal 2020 with early adoption permitted. The Company is currently evaluating the impact of the adoption of ASU No. 2016-13 on its consolidated financial statements. In August 2017, the FASB issued ASU No. 2017-12, Targeted Improvements to Accounting for Hedging Activities, which modifies the financial reporting of hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. ASU No. 2017-12 is effective in the first quarter of the Company’s fiscal 2020 with early adoption permitted. The Company does not believe the adoption of this ASU will have a material impact on its consolidated financial statements. Recent Accounting Guidance Adopted In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which had been codified in ASC Topic 606 Revenue from Contracts with Customers. The standard provides a single model for revenue arising from contracts with customers and supersedes previous revenue recognition guidance. The guidance requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of goods or services. The guidance replaces existing revenue recognition guidance in U.S. GAAP and became effective for the Company in its first quarter of fiscal 2019. Under ASC Topic 606 the timing of revenue recognition may differ from previous guidance for contracts with multiple performance obligations as revenue is recognized when control has been transferred for each performance obligation. For custom and contract manufactured products that do not have an alternate use to the Company revenue is recognized over-time when the customer agreements contain contractual termination clauses and right to payment for work performed to date which is a change from previous guidance. The Company adopted the new standard using the modified retrospective approach effective the first day of fiscal 2019. As a result of the adoption, the Company increased retained earnings, $0.5 million, net of tax. This change relates primarily to custom and contract manufacturing arrangements for certain of the Company’s irrigation and infrastructure equipment products at various stages of production at August 31, 2018 in addition to contracts with multiple performance obligations for which control of the relevant performance obligation had been satisfied. Results for reporting periods beginning September 1, 2018 are presented in accordance with ASC Topic 606, while prior period amounts are not adjusted and continue to be reported in accordance with the previously applied revenue recognition guidance. In March 2017, the FASB issued ASU No. 2017-07, Presentation of Net Periodic Benefit Cost Related to Defined Benefit Plans, which amends the income statement presentation requirements for the components of net periodic benefit cost for an entity's defined benefit pension and post-retirement plans. The Company adopted ASU No. 2017-07 in first quarter of fiscal 2019, recognizing the net periodic pension cost within other (expense) income, net. The Company also reclassified $0.2 million of net periodic pension cost for the three months and six months ended February 28, 2018, out of general and administrative expense and into other (expense) income, net. In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118 (“SAB 118”), Income Tax Accounting Implications of the Tax Cuts and Jobs Act, which provides guidance on accounting for the impacts of the U.S. Tax Cuts and Jobs Act (“U.S. Tax Reform”). SAB 118 directs companies to consider the impact of the U.S. Tax Reform as provisional when it does not have the necessary information available, prepared, or analyzed in reasonable detail to complete its accounting under ASC Topic 740, Income Taxes. The Company has completed its accounting for the tax effects of U.S. Tax Reform as more fully explained in Note 5 to the condensed consolidated financial statements. In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, which provides entities with the option to eliminate the stranded tax effects associated with the change in tax rates under U.S. Tax Reform through a reclassification of the stranded tax effects from accumulated other comprehensive income (“AOCI”) to retained earnings. The amount of the reclassification is calculated on the basis of the difference between the historical and newly enacted tax rates for deferred tax liabilities and assets related to items within AOCI. The Company adopted ASU No. 2018-02 in the first quarter of the Company’s fiscal 2019 and reclassified $0.5 million to retained earnings for the impact of stranded tax effects resulting from U.S. Tax Reform.

Basis of Presentation (Policies)

6 Months Ended

Feb. 28, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Recent Accounting Guidance Not Yet Adopted

In February 2016, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2016-02, Leases (Topic 842). The standard requires a lessee to recognize assets and liabilities arising from an operating lease on the balance sheet. Additionally, companies are permitted to make an accounting policy election to not recognize lease assets and liabilities for leases with a term of 12 months or less. The effective date of ASU No. 2016-02 will be the first quarter of the Company’s fiscal 2020 with early adoption permitted. The Company is currently in the assessment phase and is evaluating the effect that adoption of this standard will have on its consolidated financial statements.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments. The standard replaces the incurred loss impairment methodology in current U.S. GAAP with a methodology that reflects expected credit losses on instruments within its scope, including trade receivables. This update is intended to provide financial statement users with more decision-useful information about the expected credit losses. The effective date of ASU No. 2016-13 will be the first quarter of the Company’s fiscal 2020 with early adoption permitted. The Company is currently evaluating the impact of the adoption of ASU No. 2016-13 on its consolidated financial statements.

In August 2017, the FASB issued ASU No. 2017-12, Targeted Improvements to Accounting for Hedging Activities, which modifies the financial reporting of hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. ASU No. 2017-12 is effective in the first quarter of the Company’s fiscal 2020 with early adoption permitted. The Company does not believe the adoption of this ASU will have a material impact on its consolidated financial statements.

Recent Accounting Guidance Adopted

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which had been codified in ASC Topic 606 Revenue from Contracts with Customers. The standard provides a single model for revenue arising from contracts with customers and supersedes previous revenue recognition guidance. The guidance requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of goods or services. The guidance replaces existing revenue recognition guidance in U.S. GAAP and became effective for the Company in its first quarter of fiscal 2019. Under ASC Topic 606 the timing of revenue recognition may differ from previous guidance for contracts with multiple performance obligations as revenue is recognized when control has been transferred for each performance obligation. For custom and contract manufactured products that do not have an alternate use to the Company revenue is recognized over-time when the customer agreements contain contractual termination clauses and right to payment for work performed to date which is a change from previous guidance.

The Company adopted the new standard using the modified retrospective approach effective the first day of fiscal 2019. As a result of the adoption, the Company increased retained earnings, $0.5 million, net of tax. This change relates primarily to custom and contract manufacturing arrangements for certain of the Company’s irrigation and infrastructure equipment products at various stages of production at August 31, 2018 in addition to contracts with multiple performance obligations for which control of the relevant performance obligation had been satisfied. Results for reporting periods beginning September 1, 2018 are presented in accordance with ASC Topic 606, while prior period amounts are not adjusted and continue to be reported in accordance with the previously applied revenue recognition guidance.

In March 2017, the FASB issued ASU No. 2017-07, Presentation of Net Periodic Benefit Cost Related to Defined Benefit Plans, which amends the income statement presentation requirements for the components of net periodic benefit cost for an entity's defined benefit pension and post-retirement plans. The Company adopted ASU No. 2017-07 in first quarter of fiscal 2019, recognizing the net periodic pension cost within other (expense) income, net. The Company also reclassified $0.2 million of net periodic pension cost for the three months and six months ended February 28, 2018, out of general and administrative expense and into other (expense) income, net.

In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118 (“SAB 118”), Income Tax Accounting Implications of the Tax Cuts and Jobs Act, which provides guidance on accounting for the impacts of the U.S. Tax Cuts and Jobs Act (“U.S. Tax Reform”). SAB 118 directs companies to consider the impact of the U.S. Tax Reform as provisional when it does not have the necessary information available, prepared, or analyzed in reasonable detail to complete its accounting under ASC Topic 740, Income Taxes. The Company has completed its accounting for the tax effects of U.S. Tax Reform as more fully explained in Note 5 to the condensed consolidated financial statements.

In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, which provides entities with the option to eliminate the stranded tax effects associated with the change in tax rates under U.S. Tax Reform through a reclassification of the stranded tax effects from accumulated other comprehensive income (“AOCI”) to retained earnings. The amount of the reclassification is calculated on the basis of the difference between the historical and newly enacted tax rates for deferred tax liabilities and assets related to items within AOCI. The Company adopted ASU No. 2018-02 in the first quarter of the Company’s fiscal 2019 and reclassified $0.5 million to retained earnings for the impact of stranded tax effects resulting from U.S. Tax Reform.