Basis Of Presentation	9 Months Ended
Jun. 02, 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 thirty-nine-week periods ended June 2, 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 In July 2015, the FASB issued its final standard on simplifying the measurement of inventory. This standard, issued as ASU 2015-11, 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. 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 In May 2014, the FASB issued its final standard on the recognition of revenue from contracts with customers. This standard, issued as ASU 2014-09, outlines a single comprehensive model for entities to use in the accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry- specific guidance. 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 to 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. In February 2016, the FASB issued its final standard on accounting for leases. This standard, issued as ASU 2016-02, 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 annual and interim financial statement periods beginning after December 15, 2018, with earlier application permitted. The new standard is effective for the Company for its fiscal year 2020. The Company is currently evaluating this standard to determine the impact of adoption on its consolidated financial statements. 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 annual and interim financial statement periods beginning after December 15, 2019, 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 2020. 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. This standard, issued as ASU 2017-04, eliminates step 2 from the goodwill impairment test and instead requires 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 or 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 2020. Upon adoption, the Company will apply this guidance prospectively to its annual and interim goodwill impairment tests and disclose the change in accounting principle. In January 2017, the FASB issued its final standard on clarifying the definition of a business in business combinations. This standard, issued as ASU No. 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. 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 Cash Flows from Financing Activities line items were reclassified into “Other, Net” within our condensed consolidated statements of cash flows to conform to our current period presentation. These reclassifications did not affect the total amount of Cash Flows from Financing Activities.

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 thirty-nine-week periods ended June 2, 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

In July 2015, the FASB issued its final standard on simplifying the measurement of inventory. This standard, issued as ASU 2015-11, 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. 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

In May 2014, the FASB issued its final standard on the recognition of revenue from contracts with customers. This standard, issued as ASU 2014-09, outlines a single comprehensive model for entities to use in the accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry- specific guidance. 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 to 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.

In February 2016, the FASB issued its final standard on accounting for leases. This standard, issued as ASU 2016-02, 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 annual and interim financial statement periods beginning after December 15, 2018, with earlier application permitted. The new standard is effective for the Company for its fiscal year 2020. The Company is currently evaluating this standard to determine the impact of adoption on its consolidated financial statements.

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 annual and interim financial statement periods beginning after December 15, 2019, 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 2020. 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. This standard, issued as ASU 2017-04, eliminates step 2 from the goodwill impairment test and instead requires 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 or 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 2020. Upon adoption, the Company will apply this guidance prospectively to its annual and interim goodwill impairment tests and disclose the change in accounting principle.

In January 2017, the FASB issued its final standard on clarifying the definition of a business in business combinations. This standard, issued as ASU No. 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.

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 Cash Flows from Financing Activities line items were reclassified into “Other, Net” within our condensed consolidated statements of cash flows to conform to our current period presentation. These reclassifications did not affect the total amount of Cash Flows from Financing Activities.