Basis Of Presentation	6 Months Ended
Mar. 03, 2018
Basis Of Presentation [Abstract]
Basis Of Presentation	Note 1. Basis of Presentation The accompanying condensed consolidated financial statements include MSC Industrial Direct Co., Inc. (“MSC”) and all its subsidiaries (hereinafter referred to collectively as the “Company”). All intercompany balances and transactions have been eliminated in consolidation. The unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the information and notes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation (including normal recurring adjustments) have been included. Operating results for the thirteen and twenty-six-week periods ended March 3, 2018 are not necessarily indicative of the results that may be expected for the fiscal year ending September 1, 2018. For further information, refer to the financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended September 2, 2017. The Company’s fiscal year ends on the Saturday closest to August 31 of each year. Unless the context requires otherwise, references to years contained herein pertain to the Company’s fiscal year. The Company’s 2018 fiscal year will be a 52-week accounting period that will end on September 1, 2018 and its 2017 fiscal year was a 52-week accounting period that ended on September 2, 2017. Recently Adopted Accounting Pronouncements Simplifying the Measurement of Inventory In July 2015, the FASB issued ASU No. 2015-11, Simplifying the Measurement of Inventory (Topic 330), which requires an entity to measure inventory at the lower of cost and net realizable value, which consists of the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. For public entities, the updated guidance is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. The guidance is to be applied prospectively with earlier application permitted as of the beginning of an interim or annual reporting period. The Company adopted ASU 2015-11 during the first quarter of fiscal 2018 and the adoption did not have any impact on its consolidated financial statements. Accounting Pronouncements Not Yet Adopted Income Statement - Reporting Comprehensive Income In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220). This ASU provides guidance on a reclassification from accumulated other comprehensive income ("AOCI") to retained earnings for the effect of the tax rate change resulting from the Tax Cuts and Jobs Act (H.R.1) (the "Tax Reform Act"). The amendments eliminate the stranded tax effects resulting from the Tax Reform Act and will improve the usefulness of information reported to financial statement users. This ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. This ASU is effective for the Company in the first quarter of fiscal 2020. The Company is currently evaluating this standard which is not expected to have a material impact on its consolidated financial statements. Goodwill Impairment In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. ASU 2017-04 simplifies the subsequent measurement of goodwill by eliminating Step 2 in the goodwill impairment test that required an entity to calculate the implied fair value of goodwill. An entity will now apply a one-step quantitative test and record an impairment charge based on the excess of a reporting unit’s carrying amount over its fair value. ASU 2017-04 will be applied prospectively and is effective for annual and interim goodwill impairment tests conducted in fiscal years beginning after December 15, 2019. The new standard is effective for the Company for its fiscal 2021 fourth quarter goodwill impairment test. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The Company does not expect the adoption of ASU 2017-04 to have a material impact on its consolidated financial statements. Business Combinations In January 2017, the FASB issued ASU No. 2017-01, Business Combinations – Clarifying the Definition of a Business. ASU 2017-01 clarifies the definition of a business to assist entities with evaluating when a set of transferred assets and activities is considered a business. The amendment is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The new standard is effective for the Company for its fiscal year 2019, with early adoption permitted. The amendments are to be applied prospectively to business combinations that occur after the effective date. Leases In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), to increase transparency and comparability by providing additional information to users of financial statements regarding an entity’s leasing activities. ASU 2016-02 requires reporting entities to recognize lease assets and lease liabilities on the balance sheet for substantially all lease arrangements. ASU 2016-02 is effective for annual reporting periods, and interim periods therein, beginning after December 15, 2018. The new standard is effective for the Company for its fiscal year 2020. The guidance will be applied on a modified retrospective basis beginning with the earliest period presented. The Company is currently evaluating this standard to determine the impact of adoption on its consolidated financial statements. Revenue from Contracts with Customers In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance in GAAP when it becomes effective. The new standard is effective for the Company for its fiscal year 2019. Early adoption is permitted. The standard permits the use of either the retrospective or cumulative effect transition method. To date, the Company has performed a preliminary detailed review of key contracts and compared historical accounting policies and practices to the new standard. While the Company is still evaluating this standard, it is not expected that this standard will have a material impact on the Company’s consolidated financial statements. The Company will continue to evaluate ASU 2014-09 and other amendments and related interpretive guidance through the date of adoption. The Company expects to adopt ASU 2014-09 under the modified retrospective approach in the first quarter of fiscal 2019. Reclassification Certain items have been reclassified from the prior year to conform to the current year presentation.

Note 1. Basis of Presentation

The accompanying condensed consolidated financial statements include MSC Industrial Direct Co., Inc. (“MSC”) and all its subsidiaries (hereinafter referred to collectively as the “Company”). All intercompany balances and transactions have been eliminated in consolidation.

The unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the information and notes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation (including normal recurring adjustments) have been included. Operating results for the thirteen and twenty-six-week periods ended March 3, 2018 are not necessarily indicative of the results that may be expected for the fiscal year ending September 1, 2018. For further information, refer to the financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended September 2, 2017.

The Company’s fiscal year ends on the Saturday closest to August 31 of each year. Unless the context requires otherwise, references to years contained herein pertain to the Company’s fiscal year. The Company’s 2018 fiscal year will be a 52-week accounting period that will end on September 1, 2018 and its 2017 fiscal year was a 52-week accounting period that ended on September 2, 2017.

Recently Adopted Accounting Pronouncements

Simplifying the Measurement of Inventory

In July 2015, the FASB issued ASU No. 2015-11, Simplifying the Measurement of Inventory (Topic 330), which requires an entity to measure inventory at the lower of cost and net realizable value, which consists of the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. For public entities, the updated guidance is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. The guidance is to be applied prospectively with earlier application permitted as of the beginning of an interim or annual reporting period. The Company adopted ASU 2015-11 during the first quarter of fiscal 2018 and the adoption did not have any impact on its consolidated financial statements.

Accounting Pronouncements Not Yet Adopted

Income Statement - Reporting Comprehensive Income

In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220). This ASU provides guidance on a reclassification from accumulated other comprehensive income ("AOCI") to retained earnings for the effect of the tax rate change resulting from the Tax Cuts and Jobs Act (H.R.1) (the "Tax Reform Act"). The amendments eliminate the stranded tax effects resulting from the Tax Reform Act and will improve the usefulness of information reported to financial statement users. This ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. This ASU is effective for the Company in the first quarter of fiscal 2020. The Company is currently evaluating this standard which is not expected to have a material impact on its consolidated financial statements.

Goodwill Impairment

In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. ASU 2017-04 simplifies the subsequent measurement of goodwill by eliminating Step 2 in the goodwill impairment test that required an entity to calculate the implied fair value of goodwill. An entity will now apply a one-step quantitative test and record an impairment charge based on the excess of a reporting unit’s carrying amount over its fair value. ASU 2017-04 will be applied prospectively and is effective for annual and interim goodwill impairment tests conducted in fiscal years beginning after December 15, 2019. The new standard is effective for the Company for its fiscal 2021 fourth quarter goodwill impairment test. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The Company does not expect the adoption of ASU 2017-04 to have a material impact on its consolidated financial statements.

Business Combinations

In January 2017, the FASB issued ASU No. 2017-01, Business Combinations – Clarifying the Definition of a Business. ASU 2017-01 clarifies the definition of a business to assist entities with evaluating when a set of transferred assets and activities is considered a business. The amendment is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The new standard is effective for the Company for its fiscal year 2019, with early adoption permitted. The amendments are to be applied prospectively to business combinations that occur after the effective date.

Leases

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), to increase transparency and comparability by providing additional information to users of financial statements regarding an entity’s leasing activities. ASU 2016-02 requires reporting entities to recognize lease assets and lease liabilities on the balance sheet for substantially all lease arrangements. ASU 2016-02 is effective for annual reporting periods, and interim periods therein, beginning after December 15, 2018. The new standard is effective for the Company for its fiscal year 2020. The guidance will be applied on a modified retrospective basis beginning with the earliest period presented. The Company is currently evaluating this standard to determine the impact of adoption on its consolidated financial statements.

Revenue from Contracts with Customers

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance in GAAP when it becomes effective. The new standard is effective for the Company for its fiscal year 2019. Early adoption is permitted. The standard permits the use of either the retrospective or cumulative effect transition method. To date, the Company has performed a preliminary detailed review of key contracts and compared historical accounting policies and practices to the new standard. While the Company is still evaluating this standard, it is not expected that this standard will have a material impact on the Company’s consolidated financial statements. The Company will continue to evaluate ASU 2014-09 and other amendments and related interpretive guidance through the date of adoption. The Company expects to adopt ASU 2014-09 under the modified retrospective approach in the first quarter of fiscal 2019.

Reclassification

Certain items have been reclassified from the prior year to conform to the current year presentation.