New Accounting Pronouncements	6 Months Ended
Nov. 30, 2016
Accounting Changes And Error Corrections [Abstract]
New Accounting Pronouncements	NOTE 2 — NEW ACCOUNTING PRONOUNCEMENTS In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers,” which establishes a comprehensive revenue recognition standard for virtually all industries in GAAP. Under the original issuance, the new standard would have applied to annual periods beginning after December 15, 2016, including interim periods therein. However, in August 2015, the FASB issued ASU 2015-14, which extends the standard effective date by one year and includes an option to apply the standard on the original effective date. We are currently reviewing the revised guidance and assessing the potential impacts on each of our different business units’ revenue streams and on our overall Consolidated Financial Statements. In April 2015, the FASB issued ASU 2015-03, "Interest-Imputation of Interest," which changes the presentation of debt issuance costs in financial statements and specifies that debt issuance costs related to a note shall be reported in the balance sheet as a direct deduction from the face amount of the note. The guidance does not change the current requirements surrounding the recognition and measurement of debt issuance costs, and the amortization of debt issuance costs will continue to be reported as interest expense. The guidance is effective for years and interim periods within those fiscal years beginning after December 15, 2015. Early adoption is allowed for all entities and the new guidance shall be applied to all prior periods retrospectively. We adopted ASU 2015-03 on June 1, 2016. As a result, net deferred debt costs are presented as offsets to the carrying amount of the respective debt on our Consolidated Balance Sheets for each period presented. The net deferred debt costs previously reported in our May 31, 2016 Consolidated Balance Sheet in prepaid expenses and other current assets of $3.0 million and other long-term assets of $8.2 million were reclassified as offsets to long-term debt, less current maturities. There was no impact on our results of operations as a result of our adoption of ASU 2015-03. In September 2015, the FASB issued ASU No. 2015-16, “Simplifying the Accounting for Measurement-Period Adjustments,” which simplifies the treatment of adjustments to provisional amounts recognized in the period for items in a business combination for which the accounting is incomplete at the end of the reporting period. The amendments in this ASU are effective for fiscal years beginning after December 15, 2015 and for interim periods therein. Our adoption of the provisions of ASU 2015-16 beginning on June 1, 2016 did not have a material impact on our Consolidated Financial Statements. In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” which increases lease transparency and comparability among organizations. Under the new standard, lessees will be required to recognize all assets and liabilities arising from leases on the balance sheet, with the exception of leases with a term of 12 months or less, which permits a lessee to make an accounting policy election by class of underlying asset not to recognize lease assets and liabilities. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, and early adoption is permitted. The new standard requires the recognition and measurement of leases at the beginning of the earliest period presented using a modified retrospective approach, which includes a number of optional practical expedients that entities may elect to apply. We are currently evaluating the impact this guidance will have on our Consolidated Financial Statements. In March 2016, the FASB issued ASU 2016-09, “Improvements to Employee Share-Based Payment Accounting,” which makes a number of changes meant to simplify and improve accounting for share-based payments. The new guidance includes amendments to share based accounting for income taxes, the related classification in the statement of cash flows and share award forfeiture accounting. ASU 2016-09 is effective for public companies for annual reporting periods beginning after December 15, 2016, and interim periods within those reporting periods. Early adoption is permitted. We have elected to early adopt ASU 2016-09 in the first quarter of fiscal 2017. The primary impact of our adoption was the recognition of excess tax benefits related to equity compensation in our provision for income taxes rather than paid-in capital, which is a change required to be applied on a prospective basis in accordance with the new guidance. Accordingly, we recorded a discrete income tax benefit of $10.4 million for excess tax benefits generated during the three months ended August 31, 2016 and $0.9 million during the three months ended November 30, 2016 in the consolidated statements of income. The corresponding cash flows are reflected in cash provided by operating activities instead of financing activities, as was previously required. Additionally, under ASU 2016-09, we have elected to continue to estimate equity award forfeitures expected to occur to determine the amount of compensation cost to be recognized in each period. Additional amendments to the accounting for income taxes and minimum statutory withholding tax requirements had no impact on our results of operations. The presentation requirements for cash flows related to employee taxes paid for withheld shares also had no impact to any of the periods presented in our consolidated statements of cash flows since such cash flows have historically been presented as a financing activity. In August 2016, the FASB issued ASU 2016-15, “Classification of Certain Cash Receipts and Cash Payments,” which makes a number of changes meant to add or clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows. The new guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years, with early adoption permitted. Upon adoption, entities must apply the guidance retrospectively to all periods presented. We are currently evaluating the impact this guidance will have on our Consolidated Financial Statements.

NOTE 2 — NEW ACCOUNTING PRONOUNCEMENTS

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers,” which establishes a comprehensive revenue recognition standard for virtually all industries in GAAP. Under the original issuance, the new standard would have applied to annual periods beginning after December 15, 2016, including interim periods therein. However, in August 2015, the FASB issued ASU 2015-14, which extends the standard effective date by one year and includes an option to apply the standard on the original effective date. We are currently reviewing the revised guidance and assessing the potential impacts on each of our different business units’ revenue streams and on our overall Consolidated Financial Statements.

In April 2015, the FASB issued ASU 2015-03, "Interest-Imputation of Interest," which changes the presentation of debt issuance costs in financial statements and specifies that debt issuance costs related to a note shall be reported in the balance sheet as a direct deduction from the face amount of the note. The guidance does not change the current requirements surrounding the recognition and measurement of debt issuance costs, and the amortization of debt issuance costs will continue to be reported as interest expense. The guidance is effective for years and interim periods within those fiscal years beginning after December 15, 2015. Early adoption is allowed for all entities and the new guidance shall be applied to all prior periods retrospectively. We adopted ASU 2015-03 on June 1, 2016. As a result, net deferred debt costs are presented as offsets to the carrying amount of the respective debt on our Consolidated Balance Sheets for each period presented. The net deferred debt costs previously reported in our May 31, 2016 Consolidated Balance Sheet in prepaid expenses and other current assets of $3.0 million and other long-term assets of $8.2 million were reclassified as offsets to long-term debt, less current maturities. There was no impact on our results of operations as a result of our adoption of ASU 2015-03.

In September 2015, the FASB issued ASU No. 2015-16, “Simplifying the Accounting for Measurement-Period Adjustments,” which simplifies the treatment of adjustments to provisional amounts recognized in the period for items in a business combination for which the accounting is incomplete at the end of the reporting period. The amendments in this ASU are effective for fiscal years beginning after December 15, 2015 and for interim periods therein. Our adoption of the provisions of ASU 2015-16 beginning on June 1, 2016 did not have a material impact on our Consolidated Financial Statements.

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” which increases lease transparency and comparability among organizations. Under the new standard, lessees will be required to recognize all assets and liabilities arising from leases on the balance sheet, with the exception of leases with a term of 12 months or less, which permits a lessee to make an accounting policy election by class of underlying asset not to recognize lease assets and liabilities. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, and early adoption is permitted. The new standard requires the recognition and measurement of leases at the beginning of the earliest period presented using a modified retrospective approach, which includes a number of optional practical expedients that entities may elect to apply. We are currently evaluating the impact this guidance will have on our Consolidated Financial Statements.

In March 2016, the FASB issued ASU 2016-09, “Improvements to Employee Share-Based Payment Accounting,” which makes a number of changes meant to simplify and improve accounting for share-based payments. The new guidance includes amendments to share based accounting for income taxes, the related classification in the statement of cash flows and share award forfeiture accounting. ASU 2016-09 is effective for public companies for annual reporting periods beginning after December 15, 2016, and interim periods within those reporting periods. Early adoption is permitted. We have elected to early adopt ASU 2016-09 in the first quarter of fiscal 2017. The primary impact of our adoption was the recognition of excess tax benefits related to equity compensation in our provision for income taxes rather than paid-in capital, which is a change required to be applied on a prospective basis in accordance with the new guidance. Accordingly, we recorded a discrete income tax benefit of $10.4 million for excess tax benefits generated during the three months ended August 31, 2016 and $0.9 million during the three months ended November 30, 2016 in the consolidated statements of income. The corresponding cash flows are reflected in cash provided by operating activities instead of financing activities, as was previously required.

Additionally, under ASU 2016-09, we have elected to continue to estimate equity award forfeitures expected to occur to determine the amount of compensation cost to be recognized in each period. Additional amendments to the accounting for income taxes and minimum statutory withholding tax requirements had no impact on our results of operations. The presentation requirements for cash flows related to employee taxes paid for withheld shares also had no impact to any of the periods presented in our consolidated statements of cash flows since such cash flows have historically been presented as a financing activity.

In August 2016, the FASB issued ASU 2016-15, “Classification of Certain Cash Receipts and Cash Payments,” which makes a number of changes meant to add or clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows. The new guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years, with early adoption permitted. Upon adoption, entities must apply the guidance retrospectively to all periods presented. We are currently evaluating the impact this guidance will have on our Consolidated Financial Statements.