Basis Of Presentation	6 Months Ended
Mar. 02, 2019
Basis Of Presentation [Abstract]
Basis Of Presentation	Note 1. Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared by the management of MSC Industrial Direct Co., Inc. (together with its wholly owned subsidiaries and entities in which it maintains a controlling financial interest, the “Company”) and in the opinion of management include all normal recurring material adjustments necessary to present fairly the Company's financial position as of March 2, 2019 and March 3, 2018, the results of operations for the thirteen and twenty-six weeks ended March 2, 2019 and March 3, 2018, and cash flows for the twenty-six weeks ended March 2, 2019 and March 3, 2018. The September 1, 2018 financial information was derived from the Company's audited financial statements included in the Company's Annual Report on Form 10-K for the year ended September 1, 2018. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") have been condensed or omitted pursuant to the rules and regulations of the SEC. The Company, however, believes that the disclosures contained in this report comply with the requirements of Section 13(a) of the Securities Exchange Act of 1934 for a Quarterly Report on Form 10-Q and are adequate to make the information presented not misleading. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company's Annual Report on Form 10-K for the year ended September 1, 2018. 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 2019 fiscal year will be a 52-week accounting period that will end on August 31, 2019 and its 2018 fiscal year was a 52-week accounting period that ended on September 1, 2018. Principles of Consolidation The condensed consolidated financial statements include the accounts of MSC Industrial Direct Co., Inc., its wholly owned subsidiaries and entities in which it maintains a controlling financial interest. All significant intercompany balances and transactions have been eliminated in consolidation. Recently Adopted Accounting Pronouncements Effective September 2, 2018, the Company adopted the Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (Topic 606) as modified by subsequently issued ASUs 2015-14, 2016-08, 2016-10, 2016-12, 2016-20 and 2017-05. These ASUs outline a single comprehensive model for entities to use in the accounting for revenue arising from contracts with customers and supersede most current revenue recognition guidance, including industry-specific guidance. Revenue continues to be recognized when products are shipped to the customer and the customer obtains control of the products, and the adoption of these ASUs, using the modified retrospective approach, had no impact on the Company’s opening retained earnings. The Company reports its sales net of estimated sales returns and sales incentives. Sales tax collected from customers is excluded from net sales. Additional information and disclosures required by this new standard are contained in Note 2, Revenue. Effective September 2, 2018, the Company adopted ASU 2017-01, which clarifies the definition of a business to assist entities with evaluating when a set of transferred assets and activities is considered a business. This standard will be applied to appropriate business combinations that occur beginning September 2, 2018. In August 2018, the SEC amended certain disclosure requirements that were redundant, duplicative, overlapping, outdated or superseded in SEC Release No. 33-10532, Disclosure Update and Simplification. In addition, the amendments expanded the disclosure requirements on the analysis of shareholders’ equity for interim financial statements. Under the amendments, an analysis of change in each caption of shareholders’ equity presented in the consolidated balance sheet must be provided in a note or separate statement. The analysis should present a reconciliation of the beginning balance to the ending balance of each period for which a statement of comprehensive income is required to be filed. The final rules are effective for all filings made on or after November 5, 2018, with the option for the filer’s first presentation of the changes in shareholders’ equity to be included in its Form 10-Q for the quarter that begins after the effective date of the amendments. The Company has included this new presentation of interim changes in shareholders' equity. Accounting Pronouncements Not Yet Adopted In February 2016, the FASB issued its final standard on accounting for leases, ASU 2016-02, Leases (Topic 842). This standard requires that an entity that is a lessee recognize lease assets and lease liabilities on the balance sheet for all leases and disclose key information about leasing arrangements. This update is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with earlier application permitted. The new standard is effective for the Company for its fiscal year 2020. While the Company is still in the process of evaluating the effect of adoption on its consolidated financial statements and is currently assessing its leases, the Company expects the adoption will result in a significant increase in the assets and liabilities recorded on its Condensed Consolidated Balance Sheets. In June 2016, the FASB issued its final standard on measurement of credit losses on financial instruments. This standard, issued as ASU 2016-13, requires that an entity measure impairment of certain financial instruments, including trade receivables, based on expected losses rather than incurred losses. This update is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, with early adoption permitted for financial statement periods beginning after December 15, 2018. The new standard is effective for the Company for its fiscal year 2021. The Company is currently evaluating this standard to determine the impact of adoption on its consolidated financial statements. In January 2017, the FASB issued its final standard on simplifying the test for goodwill impairment, ASU 2017-04, Intangibles – Goodwill and Other (Topic 350). This standard will require an entity to perform its annual or interim goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge would be recognized for the amount by which the carrying amount exceeds the reporting unit's fair value, not to exceed the total amount of goodwill allocated to that reporting unit. This update is effective for annual and interim goodwill impairment tests in fiscal years beginning after December 15, 2019, with early adoption permitted. The new standard is effective for the Company for its fiscal year 2021. Upon adoption, the Company will apply this guidance prospectively to its annual and interim goodwill impairment tests and disclose the change in accounting principle. Other pronouncements issued by the FASB or other authoritative accounting standards groups with future effective dates are either not applicable or are not expected to be significant to the Company’s financial position, results of operations or cash flows. Reclassification Certain of the prior period line items contained in the Condensed Consolidated Statement of Shareholders’ Equity were condensed to conform to our current period presentation. The Company combined the “Exercise of common stock options”, the “Common stock issued under associate stock purchase plan”, the “Shares issued upon vesting of restricted stock units, including dividend equivalent units”, the “Stock-based compensation”, and the “Issuance of restricted common stock, net of cancellations” line items into a single line titled “Associate Incentive Plans”. These reclassifications did not affect the total amount of Shareholders’ Equity.

Note 1. Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared by the management of MSC Industrial Direct Co., Inc. (together with its wholly owned subsidiaries and entities in which it maintains a controlling financial interest, the “Company”) and in the opinion of management include all normal recurring material adjustments necessary to present fairly the Company's financial position as of March 2, 2019 and March 3, 2018, the results of operations for the thirteen and twenty-six weeks ended March 2, 2019 and March 3, 2018, and cash flows for the twenty-six weeks ended March 2, 2019 and March 3, 2018. The September 1, 2018 financial information was derived from the Company's audited financial statements included in the Company's Annual Report on Form 10-K for the year ended September 1, 2018.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") have been condensed or omitted pursuant to the rules and regulations of the SEC. The Company, however, believes that the disclosures contained in this report comply with the requirements of Section 13(a) of the Securities Exchange Act of 1934 for a Quarterly Report on Form 10-Q and are adequate to make the information presented not misleading. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company's Annual Report on Form 10-K for the year ended September 1, 2018.

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 2019 fiscal year will be a 52-week accounting period that will end on August 31, 2019 and its 2018 fiscal year was a 52-week accounting period that ended on September 1, 2018.

Principles of Consolidation

The condensed consolidated financial statements include the accounts of MSC Industrial Direct Co., Inc., its wholly owned subsidiaries and entities in which it maintains a controlling financial interest. All significant intercompany balances and transactions have been eliminated in consolidation.

Recently Adopted Accounting Pronouncements

Effective September 2, 2018, the Company adopted the Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (Topic 606) as modified by subsequently issued ASUs 2015-14, 2016-08, 2016-10, 2016-12, 2016-20 and 2017-05. These ASUs outline a single comprehensive model for entities to use in the accounting for revenue arising from contracts with customers and supersede most current revenue recognition guidance, including industry-specific guidance. Revenue continues to be recognized when products are shipped to the customer and the customer obtains control of the products, and the adoption of these ASUs, using the modified retrospective approach, had no impact on the Company’s opening retained earnings. The Company reports its sales net of estimated sales returns and sales incentives. Sales tax collected from customers is excluded from net sales. Additional information and disclosures required by this new standard are contained in Note 2, Revenue.

Effective September 2, 2018, the Company adopted ASU 2017-01, which clarifies the definition of a business to assist entities with evaluating when a set of transferred assets and activities is considered a business. This standard will be applied to appropriate business combinations that occur beginning September 2, 2018.

In August 2018, the SEC amended certain disclosure requirements that were redundant, duplicative, overlapping, outdated or superseded in SEC Release No. 33-10532, Disclosure Update and Simplification. In addition, the amendments expanded the disclosure requirements on the analysis of shareholders’ equity for interim financial statements. Under the amendments, an analysis of change in each caption of shareholders’ equity presented in the consolidated balance sheet must be provided in a note or separate statement. The analysis should present a reconciliation of the beginning balance to the ending balance of each period for which a statement of comprehensive income is required to be filed. The final rules are effective for all filings made on or after November 5, 2018, with the option for the filer’s first presentation of the changes in shareholders’ equity to be included in its Form 10-Q for the quarter that begins after the effective date of the amendments. The Company has included this new presentation of interim changes in shareholders' equity.

Accounting Pronouncements Not Yet Adopted

In February 2016, the FASB issued its final standard on accounting for leases, ASU 2016-02, Leases (Topic 842). This standard requires that an entity that is a lessee recognize lease assets and lease liabilities on the balance sheet for all leases and disclose key information about leasing arrangements. This update is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with earlier application permitted. The new standard is effective for the Company for its fiscal year 2020. While the Company is still in the process of evaluating the effect of adoption on its consolidated financial statements and is currently assessing its leases, the Company expects the adoption will result in a significant increase in the assets and liabilities recorded on its Condensed Consolidated Balance Sheets.

In June 2016, the FASB issued its final standard on measurement of credit losses on financial instruments. This standard, issued as ASU 2016-13, requires that an entity measure impairment of certain financial instruments, including trade receivables, based on expected losses rather than incurred losses. This update is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, with early adoption permitted for financial statement periods beginning after December 15, 2018. The new standard is effective for the Company for its fiscal year 2021. The Company is currently evaluating this standard to determine the impact of adoption on its consolidated financial statements.

In January 2017, the FASB issued its final standard on simplifying the test for goodwill impairment, ASU 2017-04, Intangibles – Goodwill and Other (Topic 350). This standard will require an entity to perform its annual or interim goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge would be recognized for the amount by which the carrying amount exceeds the reporting unit's fair value, not to exceed the total amount of goodwill allocated to that reporting unit. This update is effective for annual and interim goodwill impairment tests in fiscal years beginning after December 15, 2019, with early adoption permitted. The new standard is effective for the Company for its fiscal year 2021. Upon adoption, the Company will apply this guidance prospectively to its annual and interim goodwill impairment tests and disclose the change in accounting principle.

Other pronouncements issued by the FASB or other authoritative accounting standards groups with future effective dates are either not applicable or are not expected to be significant to the Company’s financial position, results of operations or cash flows.

Reclassification

Certain of the prior period line items contained in the Condensed Consolidated Statement of Shareholders’ Equity were condensed to conform to our current period presentation. The Company combined the “Exercise of common stock options”, the “Common stock issued under associate stock purchase plan”, the “Shares issued upon vesting of restricted stock units, including dividend equivalent units”, the “Stock-based compensation”, and the “Issuance of restricted common stock, net of cancellations” line items into a single line titled “Associate Incentive Plans”. These reclassifications did not affect the total amount of Shareholders’ Equity.