Worthington Industries (WOR) 10-Q 9 Jan 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Nov. 30, 2018	Dec. 31, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Nov. 30, 2018
Document Fiscal Year Focus	2,019
Document Fiscal Period Focus	Q2
Trading Symbol	WOR
Entity Registrant Name	WORTHINGTON INDUSTRIES INC
Entity Central Index Key	108,516
Current Fiscal Year End Date	--05-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		57,736,995

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Nov. 30, 2018	May 31, 2018
Current assets:
Cash and cash equivalents	$ 93,027	$ 121,967
Receivables, less allowances of $650 and $632 at November 30, 2018 and May 31, 2018, respectively	518,006	572,689
Inventories:
Raw materials	267,871	237,471
Work in process	111,158	122,977
Finished products	109,713	93,579
Total inventories	488,742	454,027
Income taxes receivable	18,079	1,650
Assets held for sale	7,395	30,655
Prepaid expenses and other current assets	62,367	60,134
Total current assets	1,187,616	1,241,122
Investments in unconsolidated affiliates	221,701	216,010
Goodwill	342,126	345,183
Other intangible assets, net of accumulated amortization of $82,659 and $74,922 at November 30, 2018 and May 31, 2018, respectively	205,142	214,026
Other assets	21,570	20,476
Property, plant and equipment:
Land	24,066	24,229
Buildings and improvements	308,549	300,542
Machinery and equipment	1,045,864	1,030,720
Construction in progress	45,077	32,282
Total property, plant and equipment	1,423,556	1,387,773
Less: accumulated depreciation	839,274	802,803
Total property, plant and equipment, net	584,282	584,970
Total assets	2,562,437	2,621,787
Current liabilities:
Accounts payable	406,444	473,485
Accrued compensation, contributions to employee benefit plans and related taxes	69,611	96,487
Dividends payable	14,348	13,731
Other accrued items	57,864	57,125
Income taxes payable	1,276	4,593
Current maturities of long-term debt	1,387	1,474
Total current liabilities	550,930	646,895
Other liabilities	73,053	74,237
Distributions in excess of investment in unconsolidated affiliate	122,806	55,198
Long-term debt	748,392	748,894
Deferred income taxes, net	81,001	60,188
Total liabilities	1,576,182	1,585,412
Shareholders' equity - controlling interest	868,672	918,769
Noncontrolling interests	117,583	117,606
Total equity	986,255	1,036,375
Total liabilities and equity	$ 2,562,437	$ 2,621,787

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Nov. 30, 2018	May 31, 2018
Statement Of Financial Position [Abstract]
Receivables, allowances	$ 650	$ 632
Other intangible assets, accumulated amortization	$ 82,659	$ 74,922

Consolidated Statements of Earn

Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Income Statement [Abstract]
Net sales	$ 958,226	$ 871,266	$ 1,946,333	$ 1,719,503
Cost of goods sold	837,292	731,187	1,682,402	1,446,646
Gross margin	120,934	140,079	263,931	272,857
Selling, general and administrative expense	84,668	89,425	175,309	177,674
Impairment of goodwill and long-lived assets		8,289	2,381	8,289
Restructuring and other expense (income), net	402	(9,694)	(534)	(7,390)
Operating income	35,864	52,059	86,775	94,284
Other income (expense):
Miscellaneous income, net	1,432	1,321	1,697	1,669
Interest expense	(9,472)	(10,038)	(19,200)	(18,845)
Equity in net income of unconsolidated affiliates	21,087	16,445	51,095	43,751
Earnings before income taxes	48,911	59,787	120,367	120,859
Income tax expense	11,119	18,165	25,617	31,163
Net earnings	37,792	41,622	94,750	89,696
Net earnings attributable to noncontrolling interests	3,790	2,219	5,806	4,759
Net earnings attributable to controlling interest	$ 34,002	$ 39,403	$ 88,944	$ 84,937
Basic
Average common shares outstanding	57,716	61,503	58,226	61,976
Earnings per share attributable to controlling interest	$ 0.59	$ 0.64	$ 1.53	$ 1.37
Diluted
Average common shares outstanding	59,338	63,468	60,013	64,044
Earnings per share attributable to controlling interest	$ 0.57	$ 0.62	$ 1.48	$ 1.33
Common shares outstanding at end of period	56,957	60,755	56,957	60,755
Cash dividends declared per share	$ 0.23	$ 0.21	$ 0.46	$ 0.42

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net earnings	$ 37,792	$ 41,622	$ 94,750	$ 89,696
Other comprehensive income (loss):
Foreign currency translation	(6,638)	1,511	(10,333)	17,383
Pension liability adjustment, net of tax			(97)	(6)
Cash flow hedges, net of tax	(4,662)	(2,210)	(6,632)	(323)
Other comprehensive income (loss)	(11,300)	(699)	(17,062)	17,054
Comprehensive income	26,492	40,923	77,688	106,750
Comprehensive income attributable to noncontrolling interests	3,735	2,139	5,734	5,118
Comprehensive income attributable to controlling interest	$ 22,757	$ 38,784	$ 71,954	$ 101,632

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Operating activities:
Net earnings	$ 37,792	$ 41,622	$ 94,750	$ 89,696
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	23,525	26,283	48,018	51,648
Impairment of goodwill and long-lived assets		8,289	2,381	8,289
Provision for (benefit from) deferred income taxes	3,289	(583)	22,223	7,351
Bad debt (income) expense	32	41	253	(21)
Equity in net income of unconsolidated affiliates, net of distributions	14,182	2,952	4,163	(4,803)
Net (gain) loss on assets	(312)	(10,680)	2,403	(9,255)
Stock-based compensation	3,456	3,787	6,612	7,194
Changes in assets and liabilities, net of impact of acquisitions:
Receivables	40,838	(46,097)	54,247	16,581
Inventories	5,866	9,871	(37,471)	(24,825)
Prepaid expenses and other current assets	(13,249)	3,622	(21,668)	4,765
Other assets	(1,194)	(626)	(1,260)	(976)
Accounts payable and accrued expenses	(71,711)	(21,577)	(100,496)	(48,368)
Other liabilities	2,190	2,478	994	5,461
Net cash provided by operating activities	44,704	19,382	75,149	102,737
Investing activities:
Investment in property, plant and equipment	(21,741)	(23,678)	(41,175)	(41,691)
Acquisitions, net of cash acquired		(523)		(285,028)
Distributions from unconsolidated affiliates	55,201		55,201
Proceeds from sale of assets	170	16,312	20,447	16,739
Net cash provided (used) by investing activities	33,630	(7,889)	34,473	(309,980)
Financing activities:
Net proceeds from short-term borrowings, net of issuance costs		302		600
Proceeds from long-term debt, net of issuance costs		(594)		197,685
Principal payments on long-term debt	(371)	(220)	(801)	(439)
Payments for issuance of common shares, net of tax withholdings	(658)	(722)	(4,749)	(3,996)
Payments to noncontrolling interests	(4,007)	(3,196)	(6,327)	(3,916)
Repurchase of common shares	(63,581)	(67,448)	(100,433)	(112,524)
Dividends paid	(13,533)	(13,256)	(26,252)	(26,034)
Net cash provided (used) by financing activities	(82,150)	(85,134)	(138,562)	51,376
Decrease in cash and cash equivalents	(3,816)	(73,641)	(28,940)	(155,867)
Cash and cash equivalents at beginning of period	96,843	195,855	121,967	278,081
Cash and cash equivalents at end of period	$ 93,027	$ 122,214	$ 93,027	$ 122,214

Basis of Presentation

Basis of Presentation	6 Months Ended
	Nov. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation	NOTE A – Basis of Presentation The consolidated financial statements include the accounts of Worthington Industries, Inc. and consolidated subsidiaries (collectively, “we,” “our,” “Worthington,” or the “Company”). Investments in unconsolidated affiliates are accounted for using the equity method. Significant intercompany accounts and transactions are eliminated. The Company owns controlling interests in the following three joint ventures: Spartan Steel Coating, LLC (“Spartan”) (52%), TWB Company, L.L.C. (“TWB”) (55%), and Worthington Specialty Processing (“WSP”) (51%). These joint ventures are consolidated with the equity owned by the other joint venture members shown as noncontrolling interests in our consolidated balance sheets, and their portions of net earnings and other comprehensive income (“OCI”) shown as net earnings or comprehensive income attributable to noncontrolling interests in our consolidated statements of earnings and consolidated statements of comprehensive income, respectively. These unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X of the United States Securities and Exchange Commission (the “SEC”). Accordingly, they do not include all of the information and notes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments, which are of a normal and recurring nature except those which have been disclosed elsewhere in this Quarterly Report on Form 10-Q, necessary for a fair presentation of the consolidated financial statements for these interim periods, have been included The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. Recently Adopted Accounting Standards On June 1, 2018, the Company adopted new accounting guidance that replaces most existing revenue recognition guidance under U.S. GAAP. See “NOTE B – Revenue Recognition” for further explanation related to this adoption, including newly required disclosures. In August 2018, the SEC adopted the final rule under SEC Release No. 33-10532; 34-83875, “Disclosure Update and Simplification,” adopting amendments to certain disclosure requirements that were redundant, duplicative, overlapping, outdated or superseded, in light of other SEC disclosure requirements, GAAP or changes in the information environment. In addition, the amendments expanded the disclosure requirements relating to the analysis of shareholders’ equity for interim financial statements. Under the amendments, an analysis of the changes in each caption of shareholders’ equity and noncontrolling interests presented in the balance sheet must be provided in a note or separate statement. The analysis shall present a reconciliation of the beginning balance to the ending balance of each period for which a statement of earnings is required to be filed. The final rule was effective on November 5, 2018. The Company adopted the final rule effective for the second quarter of fiscal 2019. The adoption of the final rule did not have a significant impact on the Company’s consolidated financial position or results of operations. See “NOTE J – Changes in Equity” for the newly required disclosures related to this adoption. Recently Issued Accounting Standards In February 2016, new accounting guidance was issued that replaces most existing lease accounting guidance under U.S. GAAP. Among other changes, the new accounting guidance requires that leased assets and liabilities be recognized on the balance sheet by lessees for those leases classified as operating leases under previous accounting guidance. The new accounting guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted, and the change is to be applied using a modified retrospective approach as of the beginning of the earliest period presented. In July 2018, the FASB issued additional accounting standard updates clarifying certain provisions, as well as providing for a second transition method allowing entities to initially apply the standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance sheet of retained earnings. The scoping and diagnostic phases of the implementation of this new accounting guidance are in process, including gathering, documenting and analyzing lease agreements subject to the new accounting guidance. While we are in the process of evaluating the effect this new accounting guidance will have on the presentation of our consolidated financial statements and related disclosures, the adoption is anticipated to have a material impact on the Company’s consolidated balance sheets with the addition of right-of-use assets, offset by the associated liabilities. In June 2016, amended accounting guidance was issued related to the measurement of credit losses on financial instruments. The amended accounting guidance changes the impairment model for most financial assets to require measurement and recognition of expected credit losses for financial assets held. The amended accounting guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. We are in the process of evaluating the effect this amended accounting guidance will have on our consolidated In August 2017, amended accounting guidance was issued that modifies hedge accounting by making more hedge strategies eligible for hedge accounting, amending presentation and disclosure requirements, and changing how companies assess effectiveness. The intent is to simplify application of hedge accounting and increase transparency of information about an entity’s risk management activities. The amended accounting guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. It is to be applied using a modified retrospective transition approach for cash flow and net investment hedges existing at the date of adoption. The presentation and disclosure guidance is only required prospectively.

Revenue Recognition

Revenue Recognition	6 Months Ended
	Nov. 30, 2018
Revenue From Contract With Customer [Abstract]
Revenue Recognition	NOTE B – Revenue Recognition Through the fiscal year ended May 31, 2018, in accordance with our historical accounting policies for revenue recognition, we recognized revenue upon transfer of title and risk of loss, or in the case of toll processing revenue, upon delivery of the goods, provided persuasive evidence of an arrangement existed, pricing was fixed or determinable and collectability was reasonably assured. Through charges to net sales, provisions were made for returns & allowances, customer rebates and sales discounts based on past experience, specific agreements, and anticipated levels of customer activity. On June 1, 2018, we adopted new accounting guidance that replaces most existing revenue recognition accounting guidance under U.S. GAAP, Accounting Standards Update 2014-09, Revenue from Contracts with Customers (Topic 606) The following table outlines the cumulative effect of adopting the new revenue recognition guidance: (in thousands) May 31, 2018 (As Reported) Cumulative Effect of Topic 606 Adoption June 1, 2018 (As Adjusted) Consolidated Balance Sheet Assets Receivables $ 572,689 $ 4,706 $ 577,395 Total inventories 454,027 (3,452 ) 450,575 Prepaid expenses and other current assets 60,134 944 61,078 Liabilities and Equity Deferred income taxes, net 60,188 454 60,642 Retained earnings 637,757 1,174 638,931 Noncontrolling interests 117,606 570 118,176 Under the new accounting guidance, we recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration we expect to receive for those goods or services, including any variable consideration Shipping and handling costs charged to customers are treated as fulfillment activities and are recorded in both net sales and cost of goods sold at the time control is transferred to the customer. Due to the short-term nature of our contracts with customers, we have elected to apply the practical expedients under Topic 606 to: (1) expense as incurred, incremental costs of obtaining a contract and (2) not adjust the consideration for the effects of a significant financing component for contracts with an original expected duration of one year or less. When we satisfy (or partially satisfy) a performance obligation, prior to being able to invoice the customer, we recognize an unbilled receivable when the right to consideration is unconditional and a contract asset when the right to consideration is conditional. Unbilled receivables and contract assets are included in receivables and prepaid and other current assets, respectively, on the consolidated balance sheets. Additionally, we do not maintain contract liability balances, as performance obligations are satisfied prior to customer payment for product. Payments from customers are generally due within 30 to 60 days of invoicing, which generally occurs upon shipment or delivery of the goods. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that we collect from a customer, are excluded from revenue. Certain contracts with customers include warranties associated with the delivered goods or services. These warranties are not considered to be separate performance obligations, and accordingly, we record an estimated liability for potential warranty costs as the goods or services are transferred. With the exception of the toll processing revenue stream and certain contracts within the oil & gas equipment revenue stream, we recognize revenue at the point in time the performance obligation is satisfied and control of the product is transferred to the customer upon shipment or delivery. Generally, we receive and acknowledge purchase orders from our customers, which define the quantity, pricing, payment and other applicable terms and conditions. In some cases, we receive a blanket purchase order from our customers, which includes pricing, payment and other terms and conditions, with quantities defined at the time each customer subsequently issues periodic releases against the blanket purchase order. For the toll processing revenue stream and certain contracts within the oil & gas equipment revenue stream, we recognize revenue over time. Revenue is primarily measured using the cost-to-cost method, which we believe best depicts the transfer of control to the customer. Under the cost-to-cost method, the extent of progress towards completion is measured based on the ratio of actual costs incurred to the total estimated costs expected upon satisfying the identified performance obligation. Revenues are recorded proportionally as costs are incurred. We have elected to not disclose the value of unsatisfied performance obligations for contracts with an original expected duration of one year or less. Certain contracts contain variable consideration, which is not constrained, and primarily include estimated sales returns, customer rebates, and sales discounts which are recorded on an expected value basis. These estimates are based on historical returns, analysis of credit memo data and other known factors. We account for rebates by recording reductions to revenue for rebates in the same period the related revenue is recorded. The amount of these reductions is based upon the terms agreed to with the customer. We do not exercise significant judgments in determining the timing of satisfaction of performance obligations or the transaction price. The following tables summarize net sales by product class and by timing of revenue recognition for the three month and six month periods ended November 30, 2018: (in thousands) Reportable Segments Three months ended November 30, 2018 Steel Processing Pressure Cylinders Engineered Cabs Other Total Product class: Steel Processing Direct $ 602,010 $ - $ - $ - $ 602,010 Toll 33,033 - - - 33,033 Pressure Cylinders Industrial products - 152,018 - - 152,018 Consumer products - 117,194 - - 117,194 Oil & gas equipment - 25,235 - - 25,235 Engineered Cabs - - 28,729 - 28,729 Other - - - 7 7 Total $ 635,043 $ 294,447 $ 28,729 $ 7 $ 958,226 Timing of revenue recognition: Goods transferred at a point in time $ 602,010 $ 276,965 $ 28,729 $ 7 $ 907,711 Goods and services transferred over time 33,033 17,482 - - 50,515 Total $ 635,043 $ 294,447 $ 28,729 $ 7 $ 958,226 (in thousands) Reportable Segments Six months ended November 30, 2018 Steel Processing Pressure Cylinders Engineered Cabs Other Total Product class: Steel Processing Direct $ 1,228,872 $ - $ - $ - $ 1,228,872 Toll 66,658 - - - 66,658 Pressure Cylinders Industrial products - 304,865 - - 304,865 Consumer products - 234,017 - - 234,017 Oil & gas equipment - 55,918 - - 55,918 Engineered Cabs - - 55,981 - 55,981 Other - - - 22 22 Total $ 1,295,530 $ 594,800 $ 55,981 $ 22 $ 1,946,333 Timing of revenue recognition: Goods transferred at a point in time $ 1,228,872 $ 565,999 $ 55,981 $ 22 $ 1,850,874 Goods and services transferred over time 66,658 28,801 - - 95,459 Total $ 1,295,530 $ 594,800 $ 55,981 $ 22 $ 1,946,333 The following tables show the adjustments that would be required to be made to our fiscal 2019 consolidated financial statements November 30, 2018 (in thousands) As Currently Reported Topic 606 Adjustments Balances Without Adoption of Topic 606 Consolidated Balance Sheet Assets Receivables $ 518,006 $ (4,750 ) $ 513,256 Total inventories 488,742 6,376 495,118 Prepaid expenses and other current assets 62,367 (4,556 ) 57,811 Liabilities and Equity Income taxes payable 1,276 (106 ) 1,170 Deferred income taxes, net 81,001 (454 ) 80,547 Shareholders' equity - controlling interest 868,672 (1,753 ) 866,919 Noncontrolling interests 117,583 (617 ) 116,966 Three months ended November 30, 2018 Six months ended November 30, 2018 (in thousands) As Currently Reported Topic 606 Adjustments Balances Without Adoption of Topic 606 As Currently Reported Topic 606 Adjustments Balances Without Adoption of Topic 606 Consolidated Statement of Earnings Net sales $ 958,226 $ (2,793 ) $ 955,433 $ 1,946,333 $ (3,656 ) $ 1,942,677 Cost of goods sold 837,292 2,320 839,612 1,682,402 2,924 1,685,326 Income tax expense 11,119 110 11,229 25,617 106 25,723 Net earnings 37,792 (363 ) 37,429 94,750 (626 ) 94,124 Net earnings attributable to noncontrolling interests 3,790 (24 ) 3,766 5,806 (48 ) 5,758 Net earnings attributable to controlling interest 34,002 (339 ) 33,663 88,944 (578 ) 88,366

Investments in Unconsolidated A

Investments in Unconsolidated Affiliates	6 Months Ended
	Nov. 30, 2018
Equity Method Investments And Joint Ventures [Abstract]
Investments in Unconsolidated Affiliates	NOTE C – Investments in Unconsolidated Affiliates Investments in affiliated companies that we do not control, either through majority ownership or otherwise, are accounted for using the equity method. These include ArtiFlex Manufacturing, LLC (“ArtiFlex”) (50%), Clarkwestern Dietrich Building Systems LLC (“ClarkDietrich”) (25%), Samuel Steel Pickling Company (31.25%), Serviacero Planos, S. de R. L. de C.V. (“Serviacero Worthington”) (50%), Worthington Armstrong Venture (“WAVE”) (50%), and Zhejiang Nisshin Worthington Precision Specialty Steel Co., Ltd. (10%). We received distributions from unconsolidated affiliates totaling $110,459,000 during the six months ended November 30, 2018, including $60,000,000 of one-time special distributions from WAVE, comprised of $35,000,000 related to the pending sale of the international operations and $25,000,000 in connection with a financing transaction. We have received cumulative distributions from WAVE in excess of our investment balance, which resulted in an amount recorded within other liabilities on our consolidated balance sheets of $122,806,000 at November 30, 2018. In accordance with the applicable accounting guidance, we reclassified the negative investment balance to the liabilities section of our consolidated balance sheet. We will continue to record our equity in the net income of WAVE as a debit to the investment account, and if the investment balance becomes positive, it will again be shown as an asset on our consolidated balance sheet. If it becomes probable that any excess distribution may not be returned (upon joint venture liquidation or otherwise), we will recognize any negative investment balance classified as a liability as income immediately. We use the “cumulative earnings” approach for determining cash flow presentation of distributions from our unconsolidated joint ventures. Distributions received are included in our consolidated statements of cash flows as operating activities, unless the cumulative distributions received, less distributions received in prior periods that were determined to be returns of investment, exceed our portion of the cumulative equity in the net earnings of the joint venture, in which case the excess distributions are deemed to be returns of the investment and are classified as investing activities in our consolidated statements of cash flows. We received excess distributions from WAVE of $55,201,000 during the six months ended November 30, 2018. The following tables summarize combined financial information for our unconsolidated affiliates as of the dates, and for the periods presented: November 30, May 31, (in thousands) 2018 2018 Cash $ 35,079 $ 52,812 Other current assets 625,214 590,578 Current assets for discontinued operations 35,390 37,640 Noncurrent assets 364,305 358,927 Total assets $ 1,059,988 $ 1,039,957 Current liabilities 256,608 166,493 Current liabilities for discontinued operations 8,884 7,142 Short-term borrowings 38,366 26,599 Current maturities of long-term debt 8,173 23,243 Long-term debt 323,598 259,588 Other noncurrent liabilities 17,452 17,536 Equity 406,907 539,356 Total liabilities and equity $ 1,059,988 $ 1,039,957 Three Months Ended November 30, Six Months Ended November 30, (in thousands) 2018 2017 2018 2017 Net sales $ 480,716 $ 412,617 $ 979,261 $ 855,241 Gross margin 75,515 71,122 179,327 157,357 Operating income 44,592 34,604 116,968 91,767 Depreciation and amortization 6,581 5,935 13,058 13,128 Interest expense 3,382 2,461 6,307 4,953 Income tax expense 3,568 1,816 8,093 3,164 Net earnings from continuing operations 36,523 31,893 101,417 82,937 Net earnings (loss) from discontinued operations 2,028 (1,703 ) 3,712 (273 ) Net earnings 38,551 30,190 105,129 82,664 The amounts presented within the discontinued operations captions in the tables above reflect the international operations of our WAVE joint venture, which are being sold as part of a broader transaction between the joint venture partner, Armstrong World Industries, Inc. (“AWI”), and Knauf Group, a family-owned manufacturer of building materials headquartered in Germany. WAVE’s portion of the total sales proceeds is expected to be approximately $90,000,000. The transaction is subject to regulatory approvals and other customary closing conditions. During the first quarter of fiscal 2019, the parties agreed to extend the date by which certain competition clearance conditions were to be satisfied per the original purchase agreement. In exchange, Knauf Group irrevocably agreed to fund the purchase price which was received by AWI in two distributions, the first on August 1, 2018, and the balance on September 15, 2018. In September 2018, we received a cash distribution of $35,000,000 from WAVE related to the pending sale of the international operations. Despite receiving the sales proceeds, there has been no change in control of the international operations, therefore, the gain or loss to be realized from this transaction has not been reflected in WAVE’s statement of earnings. We expect to receive total proceeds of approximately $45,000,000 in connection with the sale transaction.

Impairment of Goodwill and Long

Impairment of Goodwill and Long-Lived Assets	6 Months Ended
	Nov. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Impairment of Goodwill and Long-Lived Assets	NOTE D – Impairment of Goodwill and Long-Lived Assets During the first quarter of fiscal 2019, changes in the facts and circumstances related to the planned sale of our cryogenics business in Turkey, Worthington Aritas, resulted in our lowering the estimate of fair value less cost to sell to $7,000,000 which generated an impairment charge of $2,381,000. Fair value was determined using observable (Level 2) inputs. During the second quarter of fiscal 2019, we began to explore strategic alternatives related to the cryoscience business within Pressure Cylinders, which was considered to be an impairment indicator. The required impairment test indicated that the current estimate of the undiscounted future cash flows exceeded the carrying amount of approximately $34,000,000. However, it is reasonably possible any change in the estimated future cash flows may result in an impairment.

Restructuring and Other Expense

Restructuring and Other Expense (Income), Net	6 Months Ended
	Nov. 30, 2018
Restructuring And Related Activities [Abstract]
Restructuring and Other Expense (Income), Net	NOTE E – Restructuring and Other Expense (Income), Net We consider restructuring activities to be programs whereby we fundamentally change our operations such as closing and consolidating manufacturing facilities or moving manufacturing of a product to another location. Restructuring activities may also involve substantial realignment of the management structure of a business unit in response to changing market conditions. A progression of the liabilities associated with our restructuring activities, combined with a reconciliation to the restructuring and other income, net financial statement caption, in our consolidated statement of earnings is summarized below for the period presented: Balance, as of Expense Balance, as of (in thousands) May 31, 2018 (income) Payments Adjustments November 30, 2018 Early retirement and severance $ 1,116 $ 1,155 $ (1,257 ) $ (61 ) $ 953 Facility exit and other costs - 273 (231 ) 8 50 $ 1,116 1,428 $ (1,488 ) $ (53 ) $ 1,003 Net gain on sale of assets (1,962 ) Restructuring and other income, net $ (534 ) Severance and facility exit costs in the table above resulted primarily from activities related to the ongoing consolidation of the Company’s industrial gas operations in Portugal following the acquisition of AMTROL in fiscal 2018. During the six months ended November 30, 2018, the Company also completed the sale of two oil & gas manufacturing facilities resulting in a net gain of $1,962,000. The total liability associated with our restructuring activities as of November 30, 2018 is expected to be paid in the next twelve months.

Contingent Liabilities and Comm

Contingent Liabilities and Commitments	6 Months Ended
	Nov. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Contingent Liabilities and Commitments	NOTE F – Contingent Liabilities and Commitments We are defendants in certain legal actions. In the opinion of management, the outcome of these actions, which is not clearly determinable at the present time, would not significantly affect our consolidated financial position or future results of operations. We also believe that environmental issues will not have a material effect on our capital expenditures, consolidated financial position or future results of operations.

Guarantees

Guarantees	6 Months Ended
	Nov. 30, 2018
Guarantees And Product Warranties [Abstract]
Guarantees	NOTE G – Guarantees We do not have guarantees that we believe are reasonably likely to have a material current or future effect on our consolidated financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures or capital resources. However, as of November 30, 2018, we were party to an operating lease for an aircraft in which we have guaranteed a residual value at the termination of the lease. The maximum obligation under the terms of this guarantee was approximately $7,881,000 at November 30, 2018. Based on current facts and circumstances, we have estimated the likelihood of payment pursuant to this guarantee is not probable and, therefore, no amount has been recognized in our consolidated financial statements. We also had in place $13,145,000 of outstanding stand-by letters of credit issued to third-party service providers at November 30, 2018. No amounts were drawn against them at November 30, 2018.

Debt and Receivables Securitiza

Debt and Receivables Securitization	6 Months Ended
	Nov. 30, 2018
Debt Disclosure [Abstract]
Debt and Receivables Securitization	NOTE H – Debt and Receivables Securitization We maintain a $500,000,000 multi-year revolving credit facility (the “Credit Facility”) with a group of lenders which matures in February 2023. Borrowings under the Credit Facility have maturities of up to one year. We have the option to borrow at rates equal to an applicable margin over the LIBOR, Prime Rate or Overnight Bank Funding Rate. The applicable margin is determined by our credit rating. There were no borrowings outstanding under the Credit Facility at November 30, 2018. As discussed in “ we provided $13,145,000 in letters of credit for third-party beneficiaries as of November 30, 2018. While not drawn against at November 30, 2018, $450,000 of these letters of credit were issued against availability under the Credit Facility, leaving $499,550,000 available at November 30, 2018. We also maintain a $50,000,000 revolving trade accounts receivable securitization facility (the “AR Facility”) which matures in January 2019. We are in the process of renewing the AR Facility for a term of one year, with an anticipated closing date of January 15, 2019. Pursuant to the terms of the AR Facility, certain of our subsidiaries sell their accounts receivable without recourse, on a revolving basis, to Worthington Receivables Corporation (“WRC”), a wholly-owned, consolidated, bankruptcy-remote subsidiary. In turn, WRC may sell without recourse, on a revolving basis, up to $50,000,000 of undivided ownership interests in this pool of accounts receivable to a third-party bank. We retain an undivided interest in this pool and are subject to risk of loss based on the collectability of the receivables from this retained interest. Because the amount eligible to be sold excludes receivables more than 90 days past due, receivables offset by an allowance for doubtful accounts due to bankruptcy or other cause, concentrations over certain limits with specific customers and certain reserve amounts, we believe additional risk of loss is minimal. As of November 30, 2018, no undivided ownership interests in this pool of accounts receivable had been sold.

Other Comprehensive Income

Other Comprehensive Income	6 Months Ended
	Nov. 30, 2018
Equity [Abstract]
Other Comprehensive Income	NOTE I – Other Comprehensive Income The following table summarizes the tax effects on each component of OCI for the three months ended November 30: Three months ended November 30, 2018 2017 Before-Tax Tax Net-of-Tax Before-Tax Tax Net-of-Tax (in thousands) Foreign currency translation $ (6,638 ) $ - $ (6,638 ) $ 1,511 $ - $ 1,511 Pension liability adjustment - - - - - - Cash flow hedges (6,066 ) 1,404 (4,662 ) (3,495 ) 1,285 (2,210 ) Other comprehensive loss $ (12,704 ) $ 1,404 $ (11,300 ) $ (1,984 ) $ 1,285 $ (699 ) The following table summarizes the tax effects on each component of OCI for the six months ended November 30: Six months ended November 30, 2018 2017 Before-Tax Tax Net-of-Tax Before-Tax Tax Net-of-Tax (in thousands) Foreign currency translation $ (10,333 ) $ - $ (10,333 ) $ 17,383 $ - $ 17,383 Pension liability adjustment - (97 ) (97 ) - (6 ) (6 ) Cash flow hedges (8,593 ) 1,961 (6,632 ) (502 ) 179 (323 ) Other comprehensive income (loss) $ (18,926 ) $ 1,864 $ (17,062 ) $ 16,881 $ 173 $ 17,054

Changes in Equity

Changes in Equity	6 Months Ended
	Nov. 30, 2018
Equity [Abstract]
Changes in Equity	NOTE J – Changes in Equity The following tables summarize the changes in equity by component and in total for the periods presented: Controlling Interest Accumulated Other Additional Comprehensive Non- Paid-in Loss, Retained controlling (in thousands) Capital Net of Tax Earnings Total Interests Total Balance at May 31, 2018 $ 295,592 $ (14,580 ) $ 637,757 $ 918,769 $ 117,606 $ 1,036,375 Net earnings - - 54,942 54,942 2,016 56,958 Other comprehensive loss - (5,745 ) - (5,745 ) (17 ) (5,762 ) Common shares issued, net of withholding tax (4,091 ) - - (4,091 ) - (4,091 ) Common shares in NQ plans 152 - - 152 - 152 Stock-based compensation 4,838 - - 4,838 - 4,838 ASC 606 transition adjustment - - 1,174 1,174 570 1,744 Purchases and retirement of common shares (4,003 ) - (32,849 ) (36,852 ) - (36,852 ) Cash dividends declared - - (13,668 ) (13,668 ) - (13,668 ) Dividends to noncontrolling interest - - - - (2,320 ) (2,320 ) Balance at August 31, 2018 $ 292,488 $ (20,325 ) $ 647,356 $ 919,519 $ 117,855 $ 1,037,374 Net earnings - - 34,002 34,002 3,790 37,792 Other comprehensive loss - (11,245 ) - (11,245 ) (55 ) (11,300 ) Common shares issued, net of withholding tax (658 ) - - (658 ) - (658 ) Common shares in NQ plans 306 - - 306 - 306 Stock-based compensation 3,730 - - 3,730 - 3,730 Purchases and retirement of common shares (7,540 ) - (56,041 ) (63,581 ) - (63,581 ) Cash dividends declared - - (13,401 ) (13,401 ) - (13,401 ) Dividends to noncontrolling interest - - - - (4,007 ) (4,007 ) Balance at November 30, 2018 $ 288,326 $ (31,570 ) $ 611,916 $ 868,672 $ 117,583 $ 986,255 Controlling Interest Accumulated Other Additional Comprehensive Non- Paid-in Loss, Retained controlling (in thousands) Capital Net of Tax Earnings Total Interests Total Balance at May 31, 2017 $ 303,391 $ (27,775 ) $ 676,019 $ 951,635 $ 122,294 $ 1,073,929 Net earnings - - 45,534 45,534 2,540 48,074 Other comprehensive income - 17,314 - 17,314 439 17,753 Common shares issued, net of withholding tax (3,274 ) - - (3,274 ) - (3,274 ) Common shares in NQ plans 536 - - 536 - 536 Stock-based compensation 4,822 - - 4,822 - 4,822 Purchases and retirement of common shares (4,235 ) - (40,841 ) (45,076 ) - (45,076 ) Cash dividends declared - - (13,317 ) (13,317 ) - (13,317 ) Dividends to noncontrolling interest - - - - (720 ) (720 ) Balance at August 31, 2017 $ 301,240 $ (10,461 ) $ 667,395 $ 958,174 $ 124,553 $ 1,082,727 Net earnings - - 39,403 39,403 2,219 41,622 Other comprehensive loss - (619 ) - (619 ) (80 ) (699 ) Common shares issued, net of withholding tax (722 ) - - (722 ) - (722 ) Common shares in NQ plans 350 - - 350 - 350 Stock-based compensation 3,169 - - 3,169 - 3,169 Purchases and retirement of common shares (7,245 ) - (60,203 ) (67,448 ) - (67,448 ) Cash dividends declared - - (13,020 ) (13,020 ) - (13,020 ) Dividends to noncontrolling interest - - - - (3,196 ) (3,196 ) Balance at November 30, 2017 $ 296,792 $ (11,080 ) $ 633,575 $ 919,287 $ 123,496 $ 1,042,783 Of the 6,828,855 common shares of Worthington Industries, Inc. authorized for repurchase by our Board of Directors on September 27, 2017, 4,200,000 remained available for repurchase at November 30, 2018. During the first six months of fiscal 2019, we repurchased 2,300,000 common shares for $100,433,000. The following table summarizes the changes in accumulated other comprehensive loss for the period presented: Accumulated Foreign Pension Other Currency Liability Cash Flow Comprehensive Translation Adjustment Hedges Loss (in thousands) Balance as of May 31, 2018 $ (4,987 ) $ (16,071 ) $ 6,478 $ (14,580 ) Other comprehensive loss before reclassifications (10,261 ) - (4,530 ) (14,791 ) Reclassification adjustments to income (a) - - (4,063 ) (4,063 ) Income taxes - (97 ) 1,961 1,864 Balance as of November 30, 2018 $ (15,248 ) $ (16,168 ) $ (154 ) $ (31,570 ) (a) The statement of earnings classification of amounts reclassified to income for cash flow hedges is disclosed in “NOTE O – Derivative Instruments and Hedging Activities.”

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Nov. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	NOTE K – Stock-Based Compensation Non-Qualified Stock Options During the six months ended November 30, 2018, we granted non-qualified stock options covering a total of 95,600 common shares under our stock-based compensation plans. The weighted average option price of $42.86 per share was equal to the market price of the underlying common shares at the grant date. The fair value of these stock options, based on the Black-Scholes option-pricing model, calculated at the grant date, was $12.55 per share. The calculated pre-tax stock-based compensation expense for these stock options is $1,200,000 and will be recognized on a straight-line basis over the three-year vesting period, net of any forfeitures. The following assumptions were used to value these stock options: Dividend yield 2.01% - 2.16% Expected volatility 33.04% - 33.60% Risk-free interest rate 2.77% - 2.96% Expected term (years) 6.0 Expected volatility is based on the historical volatility of our common shares and the risk-free interest rate is based on the U.S. Treasury strip rate for the expected term of the stock options. The expected term was developed using historical exercise experience. Service-Based Restricted Common Shares During the six months ended November 30, 2018 Market-Based Restricted Common Shares On September 28, 2018, we granted an aggregate of 225,000 restricted common shares to two key employees under our stock-based compensation plans. Vesting of these restricted common share awards is contingent upon the price of our common shares reaching $65.00 per share and remaining at or above that price for 90 consecutive days during the five-year period following the date of grant and the completion of a five-year service vesting period. The grant-date fair value of these restricted common shares, as determined by a Monte Carlo simulation model, was $23.38 per share. The following assumptions were used to determine the grant-date fair value and the derived service period for these restricted common shares: Dividend yield 2.16 % Expected volatility 33.60 % Risk-free interest rate 2.96 % The calculated pre-tax stock-based compensation expense for these restricted common shares is $5,261,000 and will be recognized on a straight-line basis over the five-year service vesting period, net of any forfeitures. Performance Share Awards We have awarded performance shares to certain key employees under our stock-based compensation plans. These performance shares are earned based on the level of achievement with respect to corporate targets for cumulative corporate economic value added, earnings per share growth and, in the case of business unit executives, business unit operating income targets for the three-year periods ending May 31, 2019, 2020 and 2021. These performance share awards will be paid, to the extent earned, in common shares of the Company in the fiscal quarter following the end of the applicable three-year performance period. The fair values of our performance shares are determined by the closing market prices of the underlying common shares at the respective grant dates of the performance shares and the pre-tax stock-based compensation expense is based on our periodic assessment of the probability of the targets being achieved and our estimate of the number of common shares that will ultimately be issued. During the six months ended November 30, 2018

Income Taxes

Income Taxes	6 Months Ended
	Nov. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	NOTE L – Income Taxes Income tax expense for the six On December 22, 2017, the U.S. government enacted tax reform, the Tax Cuts and Jobs Act (the “TCJA”), which made comprehensive changes to U.S. federal income tax laws by moving from a global to a modified territorial tax regime. The TCJA lowered the U.S. corporate income tax rate from 35% to 21% in calendar year 2018 along with the elimination of certain deductions and credits, and a one-time “deemed repatriation” of accumulated foreign earnings. We recognized a provisional income tax benefit of $38,200,000 related to the re-measurement of deferred tax assets and liabilities and a provisional income tax expense of $6,900,000 for the one-time mandatory deemed repatriation tax during fiscal 2018. During the second quarter of fiscal 2019, we finalized the accounting for the TCJA and for the six months ended November 30, 2018, we made no material adjustments to these provisional amounts.

Earnings per Share

Earnings per Share	6 Months Ended
	Nov. 30, 2018
Earnings Per Share [Abstract]
Earnings per Share	NOTE M – Earnings per Share The following table sets forth the computation of basic and diluted earnings per share attributable to controlling interest for the periods presented: Three Months Ended November 30, Six Months Ended November 30, (in thousands, except per share amounts) 2018 2017 2018 2017 Numerator (basic & diluted): Net earnings attributable to controlling interest - income available to common shareholders $ 34,002 $ 39,403 $ 88,944 $ 84,937 Denominator: Denominator for basic earnings per share attributable to controlling interest - weighted average common shares 57,716 61,503 58,226 61,976 Effect of dilutive securities 1,622 1,965 1,787 2,068 Denominator for diluted earnings per share attributable to controlling interest - adjusted weighted average common shares 59,338 63,468 60,013 64,044 Basic earnings per share attributable to controlling interest $ 0.59 $ 0.64 $ 1.53 $ 1.37 Diluted earnings per share attributable to controlling interest $ 0.57 $ 0.62 $ 1.48 $ 1.33 Stock options covering 223,372 and 195,774 common shares for the three months ended November 30, 2018 and 2017, respectively, and 152,256 and 76,605 common shares for the six months ended November 30, 2018 and 2017, respectively, have been excluded from the computation of diluted earnings per share because the effect of their inclusion would have been “anti-dilutive” for those periods.

Segment Operations

Segment Operations	6 Months Ended
	Nov. 30, 2018
Segment Reporting [Abstract]
Segment Operations	NOTE N – Segment Operations The following table presents summarized financial information for our reportable segments as of the dates, and for the periods presented: Three Months Ended November 30, Six Months Ended November 30, (in thousands) 2018 2017 2018 2017 Net sales Steel Processing $ 635,043 $ 538,390 $ 1,295,530 $ 1,081,881 Pressure Cylinders 294,447 300,862 594,800 570,673 Engineered Cabs 28,729 30,404 55,981 62,350 Other 7 1,610 22 4,599 Total net sales $ 958,226 $ 871,266 $ 1,946,333 $ 1,719,503 Operating income (loss) Steel Processing $ 25,016 $ 41,130 $ 64,676 $ 74,002 Pressure Cylinders 14,758 24,675 29,491 35,133 Engineered Cabs (3,371 ) (1,587 ) (7,682 ) (1,948 ) Other (539 ) (12,159 ) 290 (12,903 ) Total operating income $ 35,864 $ 52,059 $ 86,775 $ 94,284 Impairment of goodwill and long-lived assets Steel Processing $ - $ - $ - $ - Pressure Cylinders - 964 2,381 964 Engineered Cabs - - - - Other - 7,325 - 7,325 Total impairment of goodwill and long-lived assets $ - $ 8,289 $ 2,381 $ 8,289 Restructuring and other expense (income), net Steel Processing $ - $ (10,335 ) $ (9 ) $ (10,056 ) Pressure Cylinders 402 488 (525 ) 2,365 Engineered Cabs - (82 ) - (78 ) Other - 235 - 379 Total restructuring and other expense (income), net $ 402 $ (9,694 ) $ (534 ) $ (7,390 ) November 30, May 31, (in thousands) 2018 2018 Total assets Steel Processing $ 963,717 $ 999,238 Pressure Cylinders 1,128,656 1,147,268 Engineered Cabs 66,590 66,456 Other 403,474 408,825 Total assets $ 2,562,437 $ 2,621,787

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	6 Months Ended
	Nov. 30, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	NOTE O – Derivative Instruments and Hedging Activities We utilize derivative financial instruments to manage exposure to certain risks related to our ongoing operations. The primary risks managed through the use of derivative instruments include interest rate risk, foreign currency exchange rate risk and commodity price risk. While certain of our derivative instruments are designated as hedging instruments, we also enter into derivative instruments that are designed to hedge a risk, but are not designated as hedging instruments and therefore do not qualify for hedge accounting. These derivative instruments are adjusted to current fair value through earnings at the end of each period. Interest Rate Risk Management Foreign Currency Exchange Rate Risk Management Commodity Price Risk Management We are exposed to counterparty credit risk on all of our derivative instruments. Accordingly, we have established and maintain strict counterparty credit guidelines. We have credit support agreements in place with certain counterparties to limit our credit exposure. These agreements require either party to post cash collateral if its cumulative market position exceeds a predefined liability threshold. Amounts posted to the margin accounts accrue interest at market rates and are required to be refunded in the period in which the cumulative market position falls below the required threshold. We do not have significant exposure to any one counterparty, and management believes the risk of loss is remote and, in any event, would not be material. Refer to "NOTE P – Fair Value" for additional information regarding the accounting treatment for our derivative instruments, as well as how fair value is determined. The following table summarizes the fair value of our derivative instruments and the respective lines in which they were recorded in the consolidated balance sheet at November 30, 2018: Asset Derivatives Liability Derivatives Balance Balance Sheet Fair Sheet Fair (in thousands) Location Value Location Value Derivatives designated as hedging instruments: Commodity contracts Receivables $ - Accounts payable $ 1,560 Other assets - Other liabilities 85 Totals $ - $ 1,645 Derivatives not designated as hedging instruments: Commodity contracts Receivables $ 890 Accounts payable $ 1,167 Other assets 92 Other liabilities 150 982 1,317 Foreign currency exchange contracts Receivables - Accounts payable 36 Totals $ 982 $ 1,353 Total derivative instruments $ 982 $ 2,998 The amounts in the table above reflect the fair value of the Company’s derivative instruments on a net basis. Had these amounts been recognized on a gross basis, the impact would have been a $961,000 increase in receivables with a corresponding increase in accounts payable. The following table summarizes the fair value of our derivative instruments and the respective lines in which they were recorded in the consolidated balance sheet at May 31, 2018: Asset Derivatives Liability Derivatives Balance Balance Sheet Fair Sheet Fair (in thousands) Location Value Location Value Derivatives designated as hedging instruments: Commodity contracts Receivables $ 6,385 Accounts payable $ - Other assets 68 Other liabilities - Totals $ 6,453 $ - Derivatives not designated as hedging instruments: Commodity contracts Receivables $ 4,749 Accounts payable $ 613 Other assets 221 Other liabilities 158 4,970 771 Foreign currency exchange contracts Receivables - Accounts payable 75 Totals $ 4,970 $ 846 Total derivative instruments $ 11,423 $ 846 The amounts in the table above reflect the fair value of the Company’s derivative instruments on a net basis. Had these amounts been recognized on a gross basis, the impact would have been a $351,000 increase in receivables with a corresponding increase in accounts payable. Cash Flow Hedges We enter into derivative instruments to hedge our exposure to changes in cash flows attributable to interest rate and commodity price fluctuations associated with certain forecasted transactions. These derivative instruments are designated and qualify as cash flow hedges. Accordingly, the effective portion of the gain or loss on the derivative instrument is reported as a component of AOCI and reclassified into earnings in the same line associated with the forecasted transaction and in the same period during which the hedged transaction affects earnings. The ineffective portion of the gain or loss on the derivative instrument is recognized in earnings immediately. The following table summarizes our cash flow hedges outstanding at November 30, 2018: Notional (in thousands) Amount Maturity Date Commodity contracts $ 22,067 December 2018 - December 2019 The following table summarizes the gain (loss) recognized in OCI and the gain (loss) reclassified from AOCI into earnings for derivative instruments designated as cash flow hedges for the periods presented: Location of Location of Gain Gain Gain (Loss) Gain (Loss) (Ineffective (Ineffective Gain (Loss) Reclassified Reclassified Portion) Portion) Recognized from from and Excluded and Excluded in OCI AOCI AOCI from from (Effective (Effective (Effective Effectiveness Effectiveness (in thousands) Portion) Portion) Portion) Testing Testing For the three months ended November 30, 2018: Commodity contracts $ (4,499 ) Cost of goods sold $ 1,565 Cost of goods sold $ - Interest rate contracts - Interest expense (34 ) Interest expense - Foreign currency exchange contracts - Miscellaneous income, net 36 Miscellaneous income, net - Totals $ (4,499 ) $ 1,567 $ - For the three months ended November 30, 2017: Commodity contracts $ 2,080 Cost of goods sold $ 5,637 Cost of goods sold $ - Interest rate contracts 34 Interest expense (28 ) Interest expense - Totals $ 2,114 $ 5,609 $ - For the six months ended November 30, 2018: Commodity contracts $ (4,530 ) Cost of goods sold $ 4,108 Cost of goods sold $ - Interest rate contracts - Interest expense (81 ) Interest expense - Foreign currency exchange contracts - Miscellaneous income, net 36 Miscellaneous income, net - Totals $ (4,530 ) $ 4,063 $ - For the six months ended November 30, 2017: Commodity contracts $ 5,814 Cost of goods sold $ 9,805 Cost of goods sold $ - Interest rate contracts 3,098 Interest expense (391 ) Interest expense - Totals $ 8,912 $ 9,414 $ - The estimated net amount of the losses recognized in AOCI at November 30, 2018 expected to be reclassified into net earnings within the succeeding twelve months is $765,000 (net of tax of $229,000). This amount was computed using the fair value of the cash flow hedges at November 30, 2018, and will change before actual reclassification from OCI to net earnings during the fiscal years ending May 31, 2019 Economic (Non-designated) Hedges We enter into foreign currency exchange contracts to manage our foreign currency exchange rate exposure related to inter-company and financing transactions that do not meet the requirements for hedge accounting treatment. We also enter into certain commodity contracts that do not qualify for hedge accounting treatment. Accordingly, these derivative instruments are adjusted to current market value at the end of each period through earnings. The following table summarizes our economic (non-designated) derivative instruments outstanding at November 30, 2018: Notional (in thousands) Amount Maturity Date(s) Commodity contracts $ 10,513 December 2018 - April 2020 Foreign currency exchange contracts 5,030 December 2018 - May 2019 The following table summarizes the gain (loss) recognized in earnings for economic (non-designated) derivative financial instruments for the periods presented: Gain (Loss) Recognized In Earnings for the Location of Gain (Loss) Three Months Ended November 30, (in thousands) Recognized in Earnings 2018 2017 Commodity contracts Cost of goods sold $ (737 ) $ (86 ) Foreign currency exchange contracts Miscellaneous income, net (1,183 ) 19 Total $ (1,920 ) $ (67 ) Gain (Loss) Recognized in Earnings for the Location of Gain (Loss) Six Months Ended November 30, (in thousands) Recognized in Earnings 2018 2017 Commodity contracts Cost of goods sold $ (2,934 ) $ 2,248 Foreign currency exchange contracts Miscellaneous income, net (2,689 ) (189 ) Total $ (5,623 ) $ 2,059 The gain (loss) on the foreign currency exchange contract derivatives significantly offsets the gain (loss) on the hedged item.

Fair Value

Fair Value	6 Months Ended
	Nov. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value	NOTE P – Fair Value Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is an exit price concept that assumes an orderly transaction between willing market participants and is required to be based on assumptions that market participants would use in pricing an asset or a liability. Current accounting guidance establishes a three-tier fair value hierarchy as a basis for considering such assumptions and for classifying the inputs used in the valuation methodologies. This hierarchy requires entities to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair values are as follows: Level 1 – Observable prices in active markets for identical assets and liabilities. Level 2 – Inputs other than quoted prices included within Level 1 that are observable for the assets and liabilities, either directly or indirectly. Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities. Recurring Fair Value Measurements At November 30, 2018, our assets and liabilities measured at fair value on a recurring basis were as follows: Significant Quoted Prices Other Significant in Active Observable Unobservable Markets Inputs Inputs (in thousands) (Level 1) (Level 2) (Level 3) Totals Assets Derivative instruments (1) $ - $ 982 $ - $ 982 Total assets $ - $ 982 $ - $ 982 Liabilities Derivative instruments (1) $ - $ 2,998 $ - $ 2,998 Total liabilities $ - $ 2,998 $ - $ 2,998 At May 31, 2018, our assets and liabilities measured at fair value on a recurring basis were as follows: Significant Quoted Prices Other Significant in Active Observable Unobservable Markets Inputs Inputs (in thousands) (Level 1) (Level 2) (Level 3) Totals Assets Derivative instruments (1) $ - $ 11,423 $ - $ 11,423 Total assets $ - $ 11,423 $ - $ 11,423 Liabilities Derivative instruments (1) $ - $ 846 $ - $ 846 Total liabilities $ - $ 846 $ - $ 846 (1) The fair value of our derivative instruments is based on the present value of the expected future cash flows considering the risks involved, including non-performance risk, and using discount rates appropriate for the respective maturities. Market observable, Level 2 inputs are used to determine the present value of the expected future cash flows. Refer to “ NOTE O – Derivative Instruments and Hedging Activities Non-Recurring Fair Value Measurements At November 30, 2018, there were no assets or liabilities measured at fair value on a non-recurring basis on our consolidated balance sheet. At May 31, 2018, our assets measured at fair value on a non-recurring basis were as follows: Significant Quoted Prices Other Significant in Active Observable Unobservable Markets Inputs Inputs (in thousands) (Level 1) (Level 2) (Level 3) Totals Assets Long-lived assets held for sale (1) $ - $ 30,000 $ - $ 30,000 Total assets $ - $ 30,000 $ - $ 30,000 1) During the fourth quarter of fiscal 2018, management committed to a plan to sell the Company’s cryogenics business in Turkey, Worthington Aritas, and certain underperforming oil & gas equipment assets within Pressure Cylinders. In accordance with the applicable accounting guidance, the net assets in each asset group were recorded at the lower of net book value or fair value less costs to sell. The book value of Worthington Aritas exceeded its fair market value of $9,000,000, resulting in an impairment charge of $42,422,000. The book value of the oil & gas equipment asset group also exceeded its estimated fair market value of $21,000,000, resulting in an impairment charge of $10,497,000. During the first quarter of fiscal 2019, the Company completed the sale of the oil & gas equipment assets described above. In addition, the Company lowered its estimate of the fair value of Worthington Aritas to $7,000,000, resulting in an impairment charge of $2,381,000. The fair value of non-derivative financial instruments included in the carrying amounts of cash and cash equivalents, receivables, notes receivable, income taxes receivable, other assets, accounts payable, accrued compensation, contributions to employee benefit plans and related taxes, other accrued items, income taxes payable and other liabilities approximate carrying value due to their short-term nature. The fair value of long-term debt, including current maturities, based upon models utilizing market observable (Level 2) inputs and credit risk, was $737,341,000 and $757,069,000 at November 30, 2018 and May 31, 2018, respectively. The carrying amount of long-term debt, including current maturities, was $749,779,000 and $750,368,000 at November 30, 2018 and May 31, 2018, respectively.

Subsequent Events

Subsequent Events	6 Months Ended
	Nov. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	NOTE Q – Subsequent Events On December 31, 2018, the Pressure Cylinders segment sold the operating assets and real property related to its solder business to an affiliate of Lincoln Electric Holdings, Inc. (“Lincoln”), for approximately $26,500,000. In addition, the parties have entered into a purchase agreement pursuant to which Lincoln will acquire certain brazing assets from the Company, with a net book value of approximately $1,900,000. The anticipated closing of the sale of the brazing assets is February 1, 2019. The Company expects to recognize a net gain in connection with these sales transactions.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Nov. 30, 2018
Accounting Policies [Abstract]
Recently Adopted and Issued Accounting Standards	Recently Adopted Accounting Standards On June 1, 2018, the Company adopted new accounting guidance that replaces most existing revenue recognition guidance under U.S. GAAP. See “NOTE B – Revenue Recognition” for further explanation related to this adoption, including newly required disclosures. In August 2018, the SEC adopted the final rule under SEC Release No. 33-10532; 34-83875, “Disclosure Update and Simplification,” adopting amendments to certain disclosure requirements that were redundant, duplicative, overlapping, outdated or superseded, in light of other SEC disclosure requirements, GAAP or changes in the information environment. In addition, the amendments expanded the disclosure requirements relating to the analysis of shareholders’ equity for interim financial statements. Under the amendments, an analysis of the changes in each caption of shareholders’ equity and noncontrolling interests presented in the balance sheet must be provided in a note or separate statement. The analysis shall present a reconciliation of the beginning balance to the ending balance of each period for which a statement of earnings is required to be filed. The final rule was effective on November 5, 2018. The Company adopted the final rule effective for the second quarter of fiscal 2019. The adoption of the final rule did not have a significant impact on the Company’s consolidated financial position or results of operations. See “NOTE J – Changes in Equity” for the newly required disclosures related to this adoption. Recently Issued Accounting Standards In February 2016, new accounting guidance was issued that replaces most existing lease accounting guidance under U.S. GAAP. Among other changes, the new accounting guidance requires that leased assets and liabilities be recognized on the balance sheet by lessees for those leases classified as operating leases under previous accounting guidance. The new accounting guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted, and the change is to be applied using a modified retrospective approach as of the beginning of the earliest period presented. In July 2018, the FASB issued additional accounting standard updates clarifying certain provisions, as well as providing for a second transition method allowing entities to initially apply the standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance sheet of retained earnings. The scoping and diagnostic phases of the implementation of this new accounting guidance are in process, including gathering, documenting and analyzing lease agreements subject to the new accounting guidance. While we are in the process of evaluating the effect this new accounting guidance will have on the presentation of our consolidated financial statements and related disclosures, the adoption is anticipated to have a material impact on the Company’s consolidated balance sheets with the addition of right-of-use assets, offset by the associated liabilities. In June 2016, amended accounting guidance was issued related to the measurement of credit losses on financial instruments. The amended accounting guidance changes the impairment model for most financial assets to require measurement and recognition of expected credit losses for financial assets held. The amended accounting guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. We are in the process of evaluating the effect this amended accounting guidance will have on our consolidated In August 2017, amended accounting guidance was issued that modifies hedge accounting by making more hedge strategies eligible for hedge accounting, amending presentation and disclosure requirements, and changing how companies assess effectiveness. The intent is to simplify application of hedge accounting and increase transparency of information about an entity’s risk management activities. The amended accounting guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. It is to be applied using a modified retrospective transition approach for cash flow and net investment hedges existing at the date of adoption. The presentation and disclosure guidance is only required prospectively.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Nov. 30, 2018
Disaggregation Of Revenue [Line Items]
Cumulative Effect of Adopting New Revenue Recognition Guidance on Consolidated Balance Sheet	The following table outlines the cumulative effect of adopting the new revenue recognition guidance: (in thousands) May 31, 2018 (As Reported) Cumulative Effect of Topic 606 Adoption June 1, 2018 (As Adjusted) Consolidated Balance Sheet Assets Receivables $ 572,689 $ 4,706 $ 577,395 Total inventories 454,027 (3,452 ) 450,575 Prepaid expenses and other current assets 60,134 944 61,078 Liabilities and Equity Deferred income taxes, net 60,188 454 60,642 Retained earnings 637,757 1,174 638,931 Noncontrolling interests 117,606 570 118,176
Revenue by Product Class and Timing	The following tables summarize net sales by product class and by timing of revenue recognition for the three month and six month periods ended November 30, 2018: (in thousands) Reportable Segments Three months ended November 30, 2018 Steel Processing Pressure Cylinders Engineered Cabs Other Total Product class: Steel Processing Direct $ 602,010 $ - $ - $ - $ 602,010 Toll 33,033 - - - 33,033 Pressure Cylinders Industrial products - 152,018 - - 152,018 Consumer products - 117,194 - - 117,194 Oil & gas equipment - 25,235 - - 25,235 Engineered Cabs - - 28,729 - 28,729 Other - - - 7 7 Total $ 635,043 $ 294,447 $ 28,729 $ 7 $ 958,226 Timing of revenue recognition: Goods transferred at a point in time $ 602,010 $ 276,965 $ 28,729 $ 7 $ 907,711 Goods and services transferred over time 33,033 17,482 - - 50,515 Total $ 635,043 $ 294,447 $ 28,729 $ 7 $ 958,226 (in thousands) Reportable Segments Six months ended November 30, 2018 Steel Processing Pressure Cylinders Engineered Cabs Other Total Product class: Steel Processing Direct $ 1,228,872 $ - $ - $ - $ 1,228,872 Toll 66,658 - - - 66,658 Pressure Cylinders Industrial products - 304,865 - - 304,865 Consumer products - 234,017 - - 234,017 Oil & gas equipment - 55,918 - - 55,918 Engineered Cabs - - 55,981 - 55,981 Other - - - 22 22 Total $ 1,295,530 $ 594,800 $ 55,981 $ 22 $ 1,946,333 Timing of revenue recognition: Goods transferred at a point in time $ 1,228,872 $ 565,999 $ 55,981 $ 22 $ 1,850,874 Goods and services transferred over time 66,658 28,801 - - 95,459 Total $ 1,295,530 $ 594,800 $ 55,981 $ 22 $ 1,946,333
Accounting Standards Update 2014-09
Disaggregation Of Revenue [Line Items]
Schedule of Adjustments on Consolidated Financial Statements	The following tables show the adjustments that would be required to be made to our fiscal 2019 consolidated financial statements November 30, 2018 (in thousands) As Currently Reported Topic 606 Adjustments Balances Without Adoption of Topic 606 Consolidated Balance Sheet Assets Receivables $ 518,006 $ (4,750 ) $ 513,256 Total inventories 488,742 6,376 495,118 Prepaid expenses and other current assets 62,367 (4,556 ) 57,811 Liabilities and Equity Income taxes payable 1,276 (106 ) 1,170 Deferred income taxes, net 81,001 (454 ) 80,547 Shareholders' equity - controlling interest 868,672 (1,753 ) 866,919 Noncontrolling interests 117,583 (617 ) 116,966 Three months ended November 30, 2018 Six months ended November 30, 2018 (in thousands) As Currently Reported Topic 606 Adjustments Balances Without Adoption of Topic 606 As Currently Reported Topic 606 Adjustments Balances Without Adoption of Topic 606 Consolidated Statement of Earnings Net sales $ 958,226 $ (2,793 ) $ 955,433 $ 1,946,333 $ (3,656 ) $ 1,942,677 Cost of goods sold 837,292 2,320 839,612 1,682,402 2,924 1,685,326 Income tax expense 11,119 110 11,229 25,617 106 25,723 Net earnings 37,792 (363 ) 37,429 94,750 (626 ) 94,124 Net earnings attributable to noncontrolling interests 3,790 (24 ) 3,766 5,806 (48 ) 5,758 Net earnings attributable to controlling interest 34,002 (339 ) 33,663 88,944 (578 ) 88,366

Investments in Unconsolidated_2

Investments in Unconsolidated Affiliates (Tables)	6 Months Ended
	Nov. 30, 2018
Equity Method Investments And Joint Ventures [Abstract]
Financial Information	The following tables summarize combined financial information for our unconsolidated affiliates as of the dates, and for the periods presented: November 30, May 31, (in thousands) 2018 2018 Cash $ 35,079 $ 52,812 Other current assets 625,214 590,578 Current assets for discontinued operations 35,390 37,640 Noncurrent assets 364,305 358,927 Total assets $ 1,059,988 $ 1,039,957 Current liabilities 256,608 166,493 Current liabilities for discontinued operations 8,884 7,142 Short-term borrowings 38,366 26,599 Current maturities of long-term debt 8,173 23,243 Long-term debt 323,598 259,588 Other noncurrent liabilities 17,452 17,536 Equity 406,907 539,356 Total liabilities and equity $ 1,059,988 $ 1,039,957 Three Months Ended November 30, Six Months Ended November 30, (in thousands) 2018 2017 2018 2017 Net sales $ 480,716 $ 412,617 $ 979,261 $ 855,241 Gross margin 75,515 71,122 179,327 157,357 Operating income 44,592 34,604 116,968 91,767 Depreciation and amortization 6,581 5,935 13,058 13,128 Interest expense 3,382 2,461 6,307 4,953 Income tax expense 3,568 1,816 8,093 3,164 Net earnings from continuing operations 36,523 31,893 101,417 82,937 Net earnings (loss) from discontinued operations 2,028 (1,703 ) 3,712 (273 ) Net earnings 38,551 30,190 105,129 82,664

Restructuring and Other Expen_2

Restructuring and Other Expense (Income), Net (Tables)	6 Months Ended
	Nov. 30, 2018
Restructuring And Related Activities [Abstract]
Schedule of Progression of Liabilities Associated with Restructuring Activities, Combined with Reconciliation to Restructuring and Other Income, Net	A progression of the liabilities associated with our restructuring activities, combined with a reconciliation to the restructuring and other income, net financial statement caption, in our consolidated statement of earnings is summarized below for the period presented: Balance, as of Expense Balance, as of (in thousands) May 31, 2018 (income) Payments Adjustments November 30, 2018 Early retirement and severance $ 1,116 $ 1,155 $ (1,257 ) $ (61 ) $ 953 Facility exit and other costs - 273 (231 ) 8 50 $ 1,116 1,428 $ (1,488 ) $ (53 ) $ 1,003 Net gain on sale of assets (1,962 ) Restructuring and other income, net $ (534 )

Other Comprehensive Income (Tab

Other Comprehensive Income (Tables)	6 Months Ended
	Nov. 30, 2018
Equity [Abstract]
Summary of Tax Effects on Each Component of OCI	The following table summarizes the tax effects on each component of OCI for the three months ended November 30: Three months ended November 30, 2018 2017 Before-Tax Tax Net-of-Tax Before-Tax Tax Net-of-Tax (in thousands) Foreign currency translation $ (6,638 ) $ - $ (6,638 ) $ 1,511 $ - $ 1,511 Pension liability adjustment - - - - - - Cash flow hedges (6,066 ) 1,404 (4,662 ) (3,495 ) 1,285 (2,210 ) Other comprehensive loss $ (12,704 ) $ 1,404 $ (11,300 ) $ (1,984 ) $ 1,285 $ (699 ) The following table summarizes the tax effects on each component of OCI for the six months ended November 30: Six months ended November 30, 2018 2017 Before-Tax Tax Net-of-Tax Before-Tax Tax Net-of-Tax (in thousands) Foreign currency translation $ (10,333 ) $ - $ (10,333 ) $ 17,383 $ - $ 17,383 Pension liability adjustment - (97 ) (97 ) - (6 ) (6 ) Cash flow hedges (8,593 ) 1,961 (6,632 ) (502 ) 179 (323 ) Other comprehensive income (loss) $ (18,926 ) $ 1,864 $ (17,062 ) $ 16,881 $ 173 $ 17,054

Changes in Equity (Tables)

Changes in Equity (Tables)	6 Months Ended
	Nov. 30, 2018
Equity [Abstract]
Summary of Changes in Equity by Component and in Total	The following tables summarize the changes in equity by component and in total for the periods presented: Controlling Interest Accumulated Other Additional Comprehensive Non- Paid-in Loss, Retained controlling (in thousands) Capital Net of Tax Earnings Total Interests Total Balance at May 31, 2018 $ 295,592 $ (14,580 ) $ 637,757 $ 918,769 $ 117,606 $ 1,036,375 Net earnings - - 54,942 54,942 2,016 56,958 Other comprehensive loss - (5,745 ) - (5,745 ) (17 ) (5,762 ) Common shares issued, net of withholding tax (4,091 ) - - (4,091 ) - (4,091 ) Common shares in NQ plans 152 - - 152 - 152 Stock-based compensation 4,838 - - 4,838 - 4,838 ASC 606 transition adjustment - - 1,174 1,174 570 1,744 Purchases and retirement of common shares (4,003 ) - (32,849 ) (36,852 ) - (36,852 ) Cash dividends declared - - (13,668 ) (13,668 ) - (13,668 ) Dividends to noncontrolling interest - - - - (2,320 ) (2,320 ) Balance at August 31, 2018 $ 292,488 $ (20,325 ) $ 647,356 $ 919,519 $ 117,855 $ 1,037,374 Net earnings - - 34,002 34,002 3,790 37,792 Other comprehensive loss - (11,245 ) - (11,245 ) (55 ) (11,300 ) Common shares issued, net of withholding tax (658 ) - - (658 ) - (658 ) Common shares in NQ plans 306 - - 306 - 306 Stock-based compensation 3,730 - - 3,730 - 3,730 Purchases and retirement of common shares (7,540 ) - (56,041 ) (63,581 ) - (63,581 ) Cash dividends declared - - (13,401 ) (13,401 ) - (13,401 ) Dividends to noncontrolling interest - - - - (4,007 ) (4,007 ) Balance at November 30, 2018 $ 288,326 $ (31,570 ) $ 611,916 $ 868,672 $ 117,583 $ 986,255 Controlling Interest Accumulated Other Additional Comprehensive Non- Paid-in Loss, Retained controlling (in thousands) Capital Net of Tax Earnings Total Interests Total Balance at May 31, 2017 $ 303,391 $ (27,775 ) $ 676,019 $ 951,635 $ 122,294 $ 1,073,929 Net earnings - - 45,534 45,534 2,540 48,074 Other comprehensive income - 17,314 - 17,314 439 17,753 Common shares issued, net of withholding tax (3,274 ) - - (3,274 ) - (3,274 ) Common shares in NQ plans 536 - - 536 - 536 Stock-based compensation 4,822 - - 4,822 - 4,822 Purchases and retirement of common shares (4,235 ) - (40,841 ) (45,076 ) - (45,076 ) Cash dividends declared - - (13,317 ) (13,317 ) - (13,317 ) Dividends to noncontrolling interest - - - - (720 ) (720 ) Balance at August 31, 2017 $ 301,240 $ (10,461 ) $ 667,395 $ 958,174 $ 124,553 $ 1,082,727 Net earnings - - 39,403 39,403 2,219 41,622 Other comprehensive loss - (619 ) - (619 ) (80 ) (699 ) Common shares issued, net of withholding tax (722 ) - - (722 ) - (722 ) Common shares in NQ plans 350 - - 350 - 350 Stock-based compensation 3,169 - - 3,169 - 3,169 Purchases and retirement of common shares (7,245 ) - (60,203 ) (67,448 ) - (67,448 ) Cash dividends declared - - (13,020 ) (13,020 ) - (13,020 ) Dividends to noncontrolling interest - - - - (3,196 ) (3,196 ) Balance at November 30, 2017 $ 296,792 $ (11,080 ) $ 633,575 $ 919,287 $ 123,496 $ 1,042,783
Summary of Changes in Accumulated Other Comprehensive Loss	The following table summarizes the changes in accumulated other comprehensive loss for the period presented: Accumulated Foreign Pension Other Currency Liability Cash Flow Comprehensive Translation Adjustment Hedges Loss (in thousands) Balance as of May 31, 2018 $ (4,987 ) $ (16,071 ) $ 6,478 $ (14,580 ) Other comprehensive loss before reclassifications (10,261 ) - (4,530 ) (14,791 ) Reclassification adjustments to income (a) - - (4,063 ) (4,063 ) Income taxes - (97 ) 1,961 1,864 Balance as of November 30, 2018 $ (15,248 ) $ (16,168 ) $ (154 ) $ (31,570 ) (a) The statement of earnings classification of amounts reclassified to income for cash flow hedges is disclosed in “NOTE O – Derivative Instruments and Hedging Activities.”

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Nov. 30, 2018
Schedule of Assumptions Used to Determine Grant Date Fair Value of Restricted Common Shares	The following assumptions were used to determine the grant-date fair value and the derived service period for these restricted common shares: Dividend yield 2.16 % Expected volatility 33.60 % Risk-free interest rate 2.96 %
Non-Qualified Stock Options
Schedule of Assumptions Used to Determine Fair Value of Stock Options	The following assumptions were used to value these stock options: Dividend yield 2.01% - 2.16% Expected volatility 33.04% - 33.60% Risk-free interest rate 2.77% - 2.96% Expected term (years) 6.0

Earnings per Share (Tables)

Earnings per Share (Tables)	6 Months Ended
	Nov. 30, 2018
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Share Attributable to Controlling Interest	The following table sets forth the computation of basic and diluted earnings per share attributable to controlling interest for the periods presented: Three Months Ended November 30, Six Months Ended November 30, (in thousands, except per share amounts) 2018 2017 2018 2017 Numerator (basic & diluted): Net earnings attributable to controlling interest - income available to common shareholders $ 34,002 $ 39,403 $ 88,944 $ 84,937 Denominator: Denominator for basic earnings per share attributable to controlling interest - weighted average common shares 57,716 61,503 58,226 61,976 Effect of dilutive securities 1,622 1,965 1,787 2,068 Denominator for diluted earnings per share attributable to controlling interest - adjusted weighted average common shares 59,338 63,468 60,013 64,044 Basic earnings per share attributable to controlling interest $ 0.59 $ 0.64 $ 1.53 $ 1.37 Diluted earnings per share attributable to controlling interest $ 0.57 $ 0.62 $ 1.48 $ 1.33

Segment Segment Operations (Tab

Segment Segment Operations (Tables)	6 Months Ended
	Nov. 30, 2018
Segment Reporting [Abstract]
Financial Information for Reportable Segments	The following table presents summarized financial information for our reportable segments as of the dates, and for the periods presented: Three Months Ended November 30, Six Months Ended November 30, (in thousands) 2018 2017 2018 2017 Net sales Steel Processing $ 635,043 $ 538,390 $ 1,295,530 $ 1,081,881 Pressure Cylinders 294,447 300,862 594,800 570,673 Engineered Cabs 28,729 30,404 55,981 62,350 Other 7 1,610 22 4,599 Total net sales $ 958,226 $ 871,266 $ 1,946,333 $ 1,719,503 Operating income (loss) Steel Processing $ 25,016 $ 41,130 $ 64,676 $ 74,002 Pressure Cylinders 14,758 24,675 29,491 35,133 Engineered Cabs (3,371 ) (1,587 ) (7,682 ) (1,948 ) Other (539 ) (12,159 ) 290 (12,903 ) Total operating income $ 35,864 $ 52,059 $ 86,775 $ 94,284 Impairment of goodwill and long-lived assets Steel Processing $ - $ - $ - $ - Pressure Cylinders - 964 2,381 964 Engineered Cabs - - - - Other - 7,325 - 7,325 Total impairment of goodwill and long-lived assets $ - $ 8,289 $ 2,381 $ 8,289 Restructuring and other expense (income), net Steel Processing $ - $ (10,335 ) $ (9 ) $ (10,056 ) Pressure Cylinders 402 488 (525 ) 2,365 Engineered Cabs - (82 ) - (78 ) Other - 235 - 379 Total restructuring and other expense (income), net $ 402 $ (9,694 ) $ (534 ) $ (7,390 ) November 30, May 31, (in thousands) 2018 2018 Total assets Steel Processing $ 963,717 $ 999,238 Pressure Cylinders 1,128,656 1,147,268 Engineered Cabs 66,590 66,456 Other 403,474 408,825 Total assets $ 2,562,437 $ 2,621,787

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Nov. 30, 2018
Schedule of Fair Value of Derivative Instruments	The following table summarizes the fair value of our derivative instruments and the respective lines in which they were recorded in the consolidated balance sheet at November 30, 2018: Asset Derivatives Liability Derivatives Balance Balance Sheet Fair Sheet Fair (in thousands) Location Value Location Value Derivatives designated as hedging instruments: Commodity contracts Receivables $ - Accounts payable $ 1,560 Other assets - Other liabilities 85 Totals $ - $ 1,645 Derivatives not designated as hedging instruments: Commodity contracts Receivables $ 890 Accounts payable $ 1,167 Other assets 92 Other liabilities 150 982 1,317 Foreign currency exchange contracts Receivables - Accounts payable 36 Totals $ 982 $ 1,353 Total derivative instruments $ 982 $ 2,998 The following table summarizes the fair value of our derivative instruments and the respective lines in which they were recorded in the consolidated balance sheet at May 31, 2018: Asset Derivatives Liability Derivatives Balance Balance Sheet Fair Sheet Fair (in thousands) Location Value Location Value Derivatives designated as hedging instruments: Commodity contracts Receivables $ 6,385 Accounts payable $ - Other assets 68 Other liabilities - Totals $ 6,453 $ - Derivatives not designated as hedging instruments: Commodity contracts Receivables $ 4,749 Accounts payable $ 613 Other assets 221 Other liabilities 158 4,970 771 Foreign currency exchange contracts Receivables - Accounts payable 75 Totals $ 4,970 $ 846 Total derivative instruments $ 11,423 $ 846
Schedule of Derivatives Designated as Cash Flow Hedging Instruments	The following table summarizes the gain (loss) recognized in OCI and the gain (loss) reclassified from AOCI into earnings for derivative instruments designated as cash flow hedges for the periods presented: Location of Location of Gain Gain Gain (Loss) Gain (Loss) (Ineffective (Ineffective Gain (Loss) Reclassified Reclassified Portion) Portion) Recognized from from and Excluded and Excluded in OCI AOCI AOCI from from (Effective (Effective (Effective Effectiveness Effectiveness (in thousands) Portion) Portion) Portion) Testing Testing For the three months ended November 30, 2018: Commodity contracts $ (4,499 ) Cost of goods sold $ 1,565 Cost of goods sold $ - Interest rate contracts - Interest expense (34 ) Interest expense - Foreign currency exchange contracts - Miscellaneous income, net 36 Miscellaneous income, net - Totals $ (4,499 ) $ 1,567 $ - For the three months ended November 30, 2017: Commodity contracts $ 2,080 Cost of goods sold $ 5,637 Cost of goods sold $ - Interest rate contracts 34 Interest expense (28 ) Interest expense - Totals $ 2,114 $ 5,609 $ - For the six months ended November 30, 2018: Commodity contracts $ (4,530 ) Cost of goods sold $ 4,108 Cost of goods sold $ - Interest rate contracts - Interest expense (81 ) Interest expense - Foreign currency exchange contracts - Miscellaneous income, net 36 Miscellaneous income, net - Totals $ (4,530 ) $ 4,063 $ - For the six months ended November 30, 2017: Commodity contracts $ 5,814 Cost of goods sold $ 9,805 Cost of goods sold $ - Interest rate contracts 3,098 Interest expense (391 ) Interest expense - Totals $ 8,912 $ 9,414 $ -
Schedule of Gain (Loss) Recognized in Earnings for Economic (Non-Designated) Derivative Financial Instruments	The following table summarizes the gain (loss) recognized in earnings for economic (non-designated) derivative financial instruments for the periods presented: Gain (Loss) Recognized In Earnings for the Location of Gain (Loss) Three Months Ended November 30, (in thousands) Recognized in Earnings 2018 2017 Commodity contracts Cost of goods sold $ (737 ) $ (86 ) Foreign currency exchange contracts Miscellaneous income, net (1,183 ) 19 Total $ (1,920 ) $ (67 ) Gain (Loss) Recognized in Earnings for the Location of Gain (Loss) Six Months Ended November 30, (in thousands) Recognized in Earnings 2018 2017 Commodity contracts Cost of goods sold $ (2,934 ) $ 2,248 Foreign currency exchange contracts Miscellaneous income, net (2,689 ) (189 ) Total $ (5,623 ) $ 2,059
Derivatives Not Designated As Hedging Instruments
Schedule of Summary of Derivative Hedges	The following table summarizes our economic (non-designated) derivative instruments outstanding at November 30, 2018: Notional (in thousands) Amount Maturity Date(s) Commodity contracts $ 10,513 December 2018 - April 2020 Foreign currency exchange contracts 5,030 December 2018 - May 2019
Cash Flow Hedges
Schedule of Summary of Derivative Hedges	The following table summarizes our cash flow hedges outstanding at November 30, 2018: Notional (in thousands) Amount Maturity Date Commodity contracts $ 22,067 December 2018 - December 2019

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Nov. 30, 2018
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis	At November 30, 2018, our assets and liabilities measured at fair value on a recurring basis were as follows: Significant Quoted Prices Other Significant in Active Observable Unobservable Markets Inputs Inputs (in thousands) (Level 1) (Level 2) (Level 3) Totals Assets Derivative instruments (1) $ - $ 982 $ - $ 982 Total assets $ - $ 982 $ - $ 982 Liabilities Derivative instruments (1) $ - $ 2,998 $ - $ 2,998 Total liabilities $ - $ 2,998 $ - $ 2,998 At May 31, 2018, our assets and liabilities measured at fair value on a recurring basis were as follows: Significant Quoted Prices Other Significant in Active Observable Unobservable Markets Inputs Inputs (in thousands) (Level 1) (Level 2) (Level 3) Totals Assets Derivative instruments (1) $ - $ 11,423 $ - $ 11,423 Total assets $ - $ 11,423 $ - $ 11,423 Liabilities Derivative instruments (1) $ - $ 846 $ - $ 846 Total liabilities $ - $ 846 $ - $ 846 (1) The fair value of our derivative instruments is based on the present value of the expected future cash flows considering the risks involved, including non-performance risk, and using discount rates appropriate for the respective maturities. Market observable, Level 2 inputs are used to determine the present value of the expected future cash flows. Refer to “ NOTE O – Derivative Instruments and Hedging Activities
Assets Measured at Fair Value on Non-Recurring Basis	At November 30, 2018, there were no assets or liabilities measured at fair value on a non-recurring basis on our consolidated balance sheet. At May 31, 2018, our assets measured at fair value on a non-recurring basis were as follows: Significant Quoted Prices Other Significant in Active Observable Unobservable Markets Inputs Inputs (in thousands) (Level 1) (Level 2) (Level 3) Totals Assets Long-lived assets held for sale (1) $ - $ 30,000 $ - $ 30,000 Total assets $ - $ 30,000 $ - $ 30,000 1) During the fourth quarter of fiscal 2018, management committed to a plan to sell the Company’s cryogenics business in Turkey, Worthington Aritas, and certain underperforming oil & gas equipment assets within Pressure Cylinders. In accordance with the applicable accounting guidance, the net assets in each asset group were recorded at the lower of net book value or fair value less costs to sell. The book value of Worthington Aritas exceeded its fair market value of $9,000,000, resulting in an impairment charge of $42,422,000. The book value of the oil & gas equipment asset group also exceeded its estimated fair market value of $21,000,000, resulting in an impairment charge of $10,497,000. During the first quarter of fiscal 2019, the Company completed the sale of the oil & gas equipment assets described above. In addition, the Company lowered its estimate of the fair value of Worthington Aritas to $7,000,000, resulting in an impairment charge of $2,381,000.

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Detail) - Joint Venture Transactions	Nov. 30, 2018Entity
Significant Accounting Policies [Line Items]
Number of joint ventures	3
Spartan
Significant Accounting Policies [Line Items]
Percent of controlling interest by the Company	52.00%
TWB
Significant Accounting Policies [Line Items]
Percent of controlling interest by the Company	55.00%
Worthington Specialty Processing
Significant Accounting Policies [Line Items]
Percent of controlling interest by the Company	51.00%

Revenue Recognition - Cumulativ

Revenue Recognition - Cumulative Effect of Adopting New Revenue Recognition Guidance on Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Nov. 30, 2018	Jun. 01, 2018	May 31, 2018
Assets
Receivables	$ 518,006		$ 572,689
Total inventories	488,742		454,027
Prepaid expenses and other current assets	62,367		60,134
Liabilities and equity
Deferred income taxes, net	81,001		60,188
Retained earnings			637,757
Noncontrolling interests	117,583		$ 117,606
Accounting Standards Update 2014-09
Assets
Receivables		$ 577,395
Total inventories		450,575
Prepaid expenses and other current assets		61,078
Liabilities and equity
Deferred income taxes, net		60,642
Retained earnings		638,931
Noncontrolling interests		118,176
Accounting Standards Update 2014-09 | Cumulative Effect of Topic 606 Adoption
Assets
Receivables	(4,750)	4,706
Total inventories	6,376	(3,452)
Prepaid expenses and other current assets	(4,556)	944
Liabilities and equity
Deferred income taxes, net	(454)	454
Retained earnings		1,174
Noncontrolling interests	$ (617)	$ 570

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Detail)	6 Months Ended
	Nov. 30, 2018
Minimum
Revenue Recognition [Line Items]
Period allowed for payment of dues to customers	30 days
Maximum
Revenue Recognition [Line Items]
Period allowed for payment of dues to customers	60 days

Revenue Recognition - Additio_2

Revenue Recognition - Additional Information (Detail1)	Nov. 30, 2018
Maximum | Accounting Standards Update 2014-09 | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-11-30
Revenue Recognition [Line Items]
Duration to satisfy performance obligation for contracts	1 year

Revenue Recognition - Revenue b

Revenue Recognition - Revenue by Product Class and Timing (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Nov. 30, 2018	Nov. 30, 2018
Disaggregation Of Revenue [Line Items]
Net sales	$ 958,226	$ 1,946,333
Goods transferred at a point in time
Disaggregation Of Revenue [Line Items]
Net sales	907,711	1,850,874
Goods and services transferred over time
Disaggregation Of Revenue [Line Items]
Net sales	50,515	95,459
Steel Processing
Disaggregation Of Revenue [Line Items]
Net sales	635,043	1,295,530
Steel Processing | Goods transferred at a point in time
Disaggregation Of Revenue [Line Items]
Net sales	602,010	1,228,872
Steel Processing | Goods and services transferred over time
Disaggregation Of Revenue [Line Items]
Net sales	33,033	66,658
Pressure Cylinders
Disaggregation Of Revenue [Line Items]
Net sales	294,447	594,800
Pressure Cylinders | Goods transferred at a point in time
Disaggregation Of Revenue [Line Items]
Net sales	276,965	565,999
Pressure Cylinders | Goods and services transferred over time
Disaggregation Of Revenue [Line Items]
Net sales	17,482	28,801
Engineered Cabs
Disaggregation Of Revenue [Line Items]
Net sales	28,729	55,981
Engineered Cabs | Goods transferred at a point in time
Disaggregation Of Revenue [Line Items]
Net sales	28,729	55,981
Other
Disaggregation Of Revenue [Line Items]
Net sales	7	22
Other | Goods transferred at a point in time
Disaggregation Of Revenue [Line Items]
Net sales	7	22
Direct
Disaggregation Of Revenue [Line Items]
Net sales	602,010	1,228,872
Direct | Steel Processing
Disaggregation Of Revenue [Line Items]
Net sales	602,010	1,228,872
Toll
Disaggregation Of Revenue [Line Items]
Net sales	33,033	66,658
Toll | Steel Processing
Disaggregation Of Revenue [Line Items]
Net sales	33,033	66,658
Industrial products
Disaggregation Of Revenue [Line Items]
Net sales	152,018	304,865
Industrial products | Pressure Cylinders
Disaggregation Of Revenue [Line Items]
Net sales	152,018	304,865
Consumer products
Disaggregation Of Revenue [Line Items]
Net sales	117,194	234,017
Consumer products | Pressure Cylinders
Disaggregation Of Revenue [Line Items]
Net sales	117,194	234,017
Oil & gas equipment
Disaggregation Of Revenue [Line Items]
Net sales	25,235	55,918
Oil & gas equipment | Pressure Cylinders
Disaggregation Of Revenue [Line Items]
Net sales	$ 25,235	$ 55,918

Revenue Recognition - Schedule

Revenue Recognition - Schedule of Adjustments on Consolidated Financial Statements (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Nov. 30, 2018	Aug. 31, 2018	Nov. 30, 2017	Aug. 31, 2017	Nov. 30, 2018	Nov. 30, 2017	Jun. 01, 2018	May 31, 2018
Assets
Receivables	$ 518,006				$ 518,006			$ 572,689
Total inventories	488,742				488,742			454,027
Prepaid expenses and other current assets	62,367				62,367			60,134
Liabilities and equity
Income taxes payable	1,276				1,276			4,593
Deferred income taxes, net	81,001				81,001			60,188
Shareholders' equity - controlling interest	868,672				868,672			918,769
Noncontrolling interests	117,583				117,583			$ 117,606
Consolidated Statement of Earnings
Net sales	958,226		$ 871,266		1,946,333	$ 1,719,503
Cost of goods sold	837,292		731,187		1,682,402	1,446,646
Income tax expense	11,119		18,165		25,617	31,163
Net earnings	37,792	$ 56,958	41,622	$ 48,074	94,750	89,696
Net earnings attributable to noncontrolling interests	3,790		2,219		5,806	4,759
Net earnings attributable to controlling interest	34,002		$ 39,403		88,944	$ 84,937
Accounting Standards Update 2014-09
Assets
Receivables							$ 577,395
Total inventories							450,575
Prepaid expenses and other current assets							61,078
Liabilities and equity
Deferred income taxes, net							60,642
Noncontrolling interests							118,176
Accounting Standards Update 2014-09 | Topic 606 Adjustments
Assets
Receivables	(4,750)				(4,750)		4,706
Total inventories	6,376				6,376		(3,452)
Prepaid expenses and other current assets	(4,556)				(4,556)		944
Liabilities and equity
Income taxes payable	(106)				(106)
Deferred income taxes, net	(454)				(454)		454
Shareholders' equity - controlling interest	(1,753)				(1,753)
Noncontrolling interests	(617)				(617)		$ 570
Consolidated Statement of Earnings
Net sales	(2,793)				(3,656)
Cost of goods sold	2,320				2,924
Income tax expense	110				106
Net earnings	(363)				(626)
Net earnings attributable to noncontrolling interests	(24)				(48)
Net earnings attributable to controlling interest	(339)				(578)
Accounting Standards Update 2014-09 | Balances Without Adoption of Topic 606
Assets
Receivables	513,256				513,256
Total inventories	495,118				495,118
Prepaid expenses and other current assets	57,811				57,811
Liabilities and equity
Income taxes payable	1,170				1,170
Deferred income taxes, net	80,547				80,547
Shareholders' equity - controlling interest	866,919				866,919
Noncontrolling interests	116,966				116,966
Consolidated Statement of Earnings
Net sales	955,433				1,942,677
Cost of goods sold	839,612				1,685,326
Income tax expense	11,229				25,723
Net earnings	37,429				94,124
Net earnings attributable to noncontrolling interests	3,766				5,758
Net earnings attributable to controlling interest	$ 33,663				$ 88,366

Investments in Unconsolidated_3

Investments in Unconsolidated Affiliates - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
	Sep. 30, 2018	Nov. 30, 2018	Nov. 30, 2018	May 31, 2018
Investments in and Advances to Affiliates [Line Items]
Distributions from unconsolidated affiliates			$ 110,459
Distributions in excess of investment in unconsolidated affiliate		$ 122,806	122,806	$ 55,198
Excess distributions from unconsolidated affiliates		$ 55,201	$ 55,201
ArtiFlex
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates		50.00%	50.00%
ClarkDietrich
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates		25.00%	25.00%
Samuel Steel Pickling Company
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates		31.25%	31.25%
Serviacero Worthington
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates		50.00%	50.00%
WAVE
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates		50.00%	50.00%
One-time special distributions			$ 60,000
Pending of sale related to international operations	$ 35,000		35,000
Financing transaction			25,000
Distributions in excess of investment in unconsolidated affiliate		$ 122,806	122,806
Excess distributions from unconsolidated affiliates			55,201
Proceeds from sale of equity method investments	$ 45,000		$ 90,000
Zhejiang Nisshin Worthington Precision Specialty Steel Co
Investments in and Advances to Affiliates [Line Items]
Percent of ownership interest held in unconsolidated affiliates		10.00%	10.00%

Investments in Unconsolidated_4

Investments in Unconsolidated Affiliates - Schedule of Combined Financial Information for Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017	May 31, 2018
Equity Method Investments And Joint Ventures [Abstract]
Cash	$ 35,079		$ 35,079		$ 52,812
Other current assets	625,214		625,214		590,578
Current assets for discontinued operations	35,390		35,390		37,640
Noncurrent assets	364,305		364,305		358,927
Total assets	1,059,988		1,059,988		1,039,957
Current liabilities	256,608		256,608		166,493
Current liabilities for discontinued operations	8,884		8,884		7,142
Short-term borrowings	38,366		38,366		26,599
Current maturities of long-term debt	8,173		8,173		23,243
Long-term debt	323,598		323,598		259,588
Other noncurrent liabilities	17,452		17,452		17,536
Equity	406,907		406,907		539,356
Total liabilities and equity	1,059,988		1,059,988		$ 1,039,957
Net sales	480,716	$ 412,617	979,261	$ 855,241
Gross margin	75,515	71,122	179,327	157,357
Operating income	44,592	34,604	116,968	91,767
Depreciation and amortization	6,581	5,935	13,058	13,128
Interest expense	3,382	2,461	6,307	4,953
Income tax expense	3,568	1,816	8,093	3,164
Net earnings from continuing operations	36,523	31,893	101,417	82,937
Net earnings (loss) from discontinued operations	2,028	(1,703)	3,712	(273)
Net earnings	$ 38,551	$ 30,190	$ 105,129	$ 82,664

Impairment of Goodwill and Lo_2

Impairment of Goodwill and Long-Lived Assets - Additional Information (Detail) - USD ($)	3 Months Ended				6 Months Ended
	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Impaired Long Lived Assets Held And Used [Line Items]
Impairment of long-lived assets				$ 8,289,000	$ 2,381,000	$ 8,289,000
Pressure Cylinders
Impaired Long Lived Assets Held And Used [Line Items]
Impairment of long-lived assets				$ 964,000	2,381,000	$ 964,000
Carrying value long-lived assets	$ 34,000,000
Worthington Aritas
Impaired Long Lived Assets Held And Used [Line Items]
Impairment of long-lived assets		$ 2,381,000	$ 42,422,000
Fair Value, Measurements, Nonrecurring
Impaired Long Lived Assets Held And Used [Line Items]
Fair market value of assets	$ 0		30,000,000		$ 0
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)
Impaired Long Lived Assets Held And Used [Line Items]
Fair market value of assets			30,000,000
Fair Value, Measurements, Nonrecurring | Worthington Aritas
Impaired Long Lived Assets Held And Used [Line Items]
Fair market value of assets		7,000,000	$ 9,000,000
Fair Value, Measurements, Nonrecurring | Worthington Aritas | Significant Other Observable Inputs (Level 2)
Impaired Long Lived Assets Held And Used [Line Items]
Fair market value of assets		$ 7,000,000

Restructuring and Other Expen_3

Restructuring and Other Expense (Income), Net - Schedule of Progression of Liabilities Associated with Restructuring Activities, Combined with Reconciliation to Restructuring and Other Income, Net (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Restructuring Cost and Reserve [Line Items]
Beginning Balance			$ 1,116
Expense (income)			1,428
Payments			(1,488)
Adjustments			(53)
Ending Balance	$ 1,003		1,003
Net gain on sale of assets			(1,962)
Restructuring and other income, net	402	$ (9,694)	(534)	$ (7,390)
Early Retirement And Severance
Restructuring Cost and Reserve [Line Items]
Beginning Balance			1,116
Expense (income)			1,155
Payments			(1,257)
Adjustments			(61)
Ending Balance	953		953
Facility Exit And Other Costs
Restructuring Cost and Reserve [Line Items]
Beginning Balance			0
Expense (income)			273
Payments			(231)
Adjustments			8
Ending Balance	$ 50		$ 50

Restructuring and Other Expen_4

Restructuring and Other Expense (Income), Net - Additional Information (Detail) $ in Thousands	6 Months Ended
	Nov. 30, 2018USD ($)Facility
Restructuring And Related Activities [Abstract]
Net gain on sale of assets | $	$ 1,962
Number of facilities sold | Facility	2

Guarantees - Additional Informa

Guarantees - Additional Information (Detail)	Nov. 30, 2018USD ($)
Stand-by Letters of Credit
Guarantor Obligations [Line Items]
Letter of credit amount outstanding	$ 13,145,000
Drawn amount of letter of credit outstanding	0
Operating Lease of Aircraft
Guarantor Obligations [Line Items]
Maximum potential obligation	$ 7,881,000

Debt and Receivables Securiti_2

Debt and Receivables Securitization - Additional Information (Detail) - USD ($)	Feb. 16, 2018	Nov. 30, 2018	May 31, 2018
Debt And Receivables Securitization [Line Items]
Remaining borrowing capacity		$ 499,550,000
Securities Sold under Agreements to Repurchase
Debt And Receivables Securitization [Line Items]
Borrowings outstanding			$ 0
Number of days past due trade accounts receivables are ineligible for securitization		90 days
Maximum
Debt And Receivables Securitization [Line Items]
Debt maturity period		1 year
Unsecured Revolving Credit Facility
Debt And Receivables Securitization [Line Items]
Maximum borrowing capacity		$ 500,000,000
Maturity date	2023-02
Borrowings outstanding		0
Stand-by Letters of Credit
Debt And Receivables Securitization [Line Items]
Letter of credit amount outstanding		13,145,000
Drawn amount of letter of credit outstanding		0
Letter of Credit
Debt And Receivables Securitization [Line Items]
Letter of credit amount outstanding		$ 450,000
AR Facility
Debt And Receivables Securitization [Line Items]
Debt instrument, renewal term		1 year

Other Comprehensive Income - Su

Other Comprehensive Income - Summary of Tax Effects on Each Component of OCI (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Nov. 30, 2018	Aug. 31, 2018	Nov. 30, 2017	Aug. 31, 2017	Nov. 30, 2018	Nov. 30, 2017
Components Of Other Comprehensive Income Loss [Abstract]
Foreign currency translation, before tax	$ (6,638)		$ 1,511		$ (10,333)	$ 17,383
Foreign currency translation, net of tax tax	(6,638)		1,511		(10,333)	17,383
Pension liability adjustment, tax					(97)	(6)
Pension liability adjustment, net of tax					(97)	(6)
Cash flow hedges, before tax	(6,066)		(3,495)		(8,593)	(502)
Cash flow hedges, tax	1,404		1,285		1,961	179
Cash flow hedges, net of tax	(4,662)		(2,210)		(6,632)	(323)
Other comprehensive income (loss), before tax	(12,704)		(1,984)		(18,926)	16,881
Other comprehensive income (loss), tax	1,404		1,285		1,864	173
Other comprehensive income (loss)	$ (11,300)	$ (5,762)	$ (699)	$ 17,753	$ (17,062)	$ 17,054

Changes in Equity - Summary of

Changes in Equity - Summary of Changes in Equity by Component and in Total (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Nov. 30, 2018	Aug. 31, 2018	Nov. 30, 2017	Aug. 31, 2017	Nov. 30, 2018	Nov. 30, 2017
Beginning Balance	$ 1,037,374	$ 1,036,375	$ 1,082,727	$ 1,073,929	$ 1,036,375	$ 1,073,929
Net earnings	37,792	56,958	41,622	48,074	94,750	89,696
Other comprehensive income (loss)	(11,300)	(5,762)	(699)	17,753	(17,062)	17,054
Common shares issued, net of withholding tax	(658)	(4,091)	(722)	(3,274)
Common shares in NQ plans	306	152	350	536
Stock-based compensation	3,730	4,838	3,169	4,822
Purchases and retirement of common shares	(63,581)	(36,852)	(67,448)	(45,076)
Cash dividends declared	(13,401)	(13,668)	(13,020)	(13,317)
Dividends to noncontrolling interest	(4,007)	(2,320)	(3,196)	(720)
Ending Balance	986,255	1,037,374	1,042,783	1,082,727	986,255	1,042,783
Accounting Standards Update 2014-09
ASC 606 transition adjustment		1,744
Additional Paid-in Capital
Beginning Balance	292,488	295,592	301,240	303,391	295,592	303,391
Common shares issued, net of withholding tax	(658)	(4,091)	(722)	(3,274)
Common shares in NQ plans	306	152	350	536
Stock-based compensation	3,730	4,838	3,169	4,822
Purchases and retirement of common shares	(7,540)	(4,003)	(7,245)	(4,235)
Ending Balance	288,326	292,488	296,792	301,240	288,326	296,792
AOCI Attributable to Parent
Beginning Balance	(20,325)	(14,580)	(10,461)	(27,775)	(14,580)	(27,775)
Other comprehensive income (loss)	(11,245)	(5,745)	(619)	17,314
Ending Balance	(31,570)	(20,325)	(11,080)	(10,461)	(31,570)	(11,080)
Retained Earnings
Beginning Balance	647,356	637,757	667,395	676,019	637,757	676,019
Net earnings	34,002	54,942	39,403	45,534
Purchases and retirement of common shares	(56,041)	(32,849)	(60,203)	(40,841)
Cash dividends declared	(13,401)	(13,668)	(13,020)	(13,317)
Ending Balance	611,916	647,356	633,575	667,395	611,916	633,575
Retained Earnings | Accounting Standards Update 2014-09
ASC 606 transition adjustment		1,174
Parent
Beginning Balance	919,519	918,769	958,174	951,635	918,769	951,635
Net earnings	34,002	54,942	39,403	45,534
Other comprehensive income (loss)	(11,245)	(5,745)	(619)	17,314
Common shares issued, net of withholding tax	(658)	(4,091)	(722)	(3,274)
Common shares in NQ plans	306	152	350	536
Stock-based compensation	3,730	4,838	3,169	4,822
Purchases and retirement of common shares	(63,581)	(36,852)	(67,448)	(45,076)
Cash dividends declared	(13,401)	(13,668)	(13,020)	(13,317)
Ending Balance	868,672	919,519	919,287	958,174	868,672	919,287
Parent | Accounting Standards Update 2014-09
ASC 606 transition adjustment		1,174
Noncontrolling Interest
Beginning Balance	117,855	117,606	124,553	122,294	117,606	122,294
Net earnings	3,790	2,016	2,219	2,540
Other comprehensive income (loss)	(55)	(17)	(80)	439
Dividends to noncontrolling interest	(4,007)	(2,320)	(3,196)	(720)
Ending Balance	$ 117,583	117,855	$ 123,496	$ 124,553	$ 117,583	$ 123,496
Noncontrolling Interest | Accounting Standards Update 2014-09
ASC 606 transition adjustment		$ 570

Changes in Equity - Additional

Changes in Equity - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017	Sep. 27, 2017
Class Of Stock [Line Items]
Common stock shares repurchased, value	$ 63,581	$ 67,448	$ 100,433	$ 112,524
Stock Repurchase
Class Of Stock [Line Items]
Common Stock shares authorized for repurchase					6,828,855
Common Stock remaining shares authorized for repurchase	4,200,000		4,200,000
Common stock shares repurchased			2,300,000
Common stock shares repurchased, value			$ 100,433

Changes in Equity - Summary o_2

Changes in Equity - Summary of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		$ 1,037,374	$ 1,082,727	$ 1,036,375	$ 1,073,929
Income taxes		(1,404)	(1,285)	(1,864)	(173)
Ending Balance		986,255	1,042,783	986,255	1,042,783
Accumulated Foreign Currency Adjustment Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance				(4,987)
Other comprehensive loss before reclassifications				(10,261)
Ending Balance		(15,248)		(15,248)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance				(16,071)
Income taxes				(97)
Ending Balance		(16,168)		(16,168)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance				6,478
Other comprehensive loss before reclassifications				(4,530)
Reclassification adjustments to income	[1]			(4,063)
Income taxes				1,961
Ending Balance		(154)		(154)
AOCI Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(20,325)	(10,461)	(14,580)	(27,775)
Other comprehensive loss before reclassifications				(14,791)
Reclassification adjustments to income	[1]			(4,063)
Income taxes				1,864
Ending Balance		$ (31,570)	$ (11,080)	$ (31,570)	$ (11,080)
[1]	The statement of earnings classification of amounts reclassified to income for cash flow hedges is disclosed in “NOTE O – Derivative Instruments and Hedging Activities.”

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Sep. 28, 2018	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax stock-based compensation expense		$ 3,456	$ 3,787	$ 6,612	$ 7,194
Non-Qualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-qualified stock options, granted				95,600
Non-qualified stock option, per share weighted average price				$ 42.86
Non-qualified stock option, fair value, per share price				$ 12.55
Pre-tax stock-based compensation, period of recognition				3 years
Pre-tax stock-based compensation expense				$ 1,200
Service-Based Restricted Common Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax stock-based compensation, period of recognition				3 years
Pre-tax stock-based compensation expense				$ 14,119
Restricted common shares, granted				323,925
Restricted common shares, fair value per share				$ 43.59
Market-Based Restricted Common Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax stock-based compensation, period of recognition	5 years
Pre-tax stock-based compensation expense	$ 5,261
Restricted common shares, granted	225,000
Restricted common shares, fair value per share	$ 23.38
Common share awards vesting, minimum price per share	$ 65
Common share awards vesting, minimum consecutive days at stated price	90 days
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax stock-based compensation expense				$ 2,494
Restricted common shares, granted				58,200
Pre-tax stock-based compensation, period of recognition				3 years

Stock-Based Compensation - Assu

Stock-Based Compensation - Assumptions To Value Stock Options (Detail) - Non-Qualified Stock Options	6 Months Ended
	Nov. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	6 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	2.01%
Expected volatility	33.04%
Risk-free interest rate	2.77%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	2.16%
Expected volatility	33.60%
Risk-free interest rate	2.96%

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Assumptions Used to Determine Grant Date Fair Value of Restricted Common Shares (Detail) - Market-Based Restricted Common Shares	Sep. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	2.16%
Expected volatility	33.60%
Risk-free interest rate	2.96%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	5 Months Ended	6 Months Ended		7 Months Ended	12 Months Ended
	May 31, 2018	Nov. 30, 2018	Nov. 30, 2017	Dec. 31, 2017	May 31, 2018
Income Tax Disclosure [Abstract]
Estimated annual effective income tax rate		23.40%	30.00%
Federal statutory income tax rate	21.00%			35.00%
Provisional income tax benefit related to re-measurement of deferred tax assets and liabilities					$ 38,200
Provisional income tax expense related to repatriation tax					$ 6,900

Earnings Per Share - Computatio

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share Attributable to Controlling Interest (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Numerator (basic & diluted):
Net earnings attributable to controlling interest - income available to common shareholders	$ 34,002	$ 39,403	$ 88,944	$ 84,937
Denominator:
Denominator for basic earnings per share attributable to controlling interest-weighted average common shares	57,716	61,503	58,226	61,976
Effect of dilutive securities	1,622	1,965	1,787	2,068
Denominator for diluted earnings per share attributable to controlling interest-adjusted weighted average common shares	59,338	63,468	60,013	64,044
Basic earnings per share attributable to controlling interest	$ 0.59	$ 0.64	$ 1.53	$ 1.37
Diluted earnings per share attributable to controlling interest	$ 0.57	$ 0.62	$ 1.48	$ 1.33

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares	3 Months Ended		6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Earnings Per Share [Abstract]
Shares excluded from computation of diluted earnings per share	223,372	195,774	152,256	76,605

Segment Operations - Financial

Segment Operations - Financial Information for Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017	May 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 958,226	$ 871,266	$ 1,946,333	$ 1,719,503
Operating income (loss)	35,864	52,059	86,775	94,284
Impairment of goodwill and long-lived assets		8,289	2,381	8,289
Restructuring and other expense (income), net	402	(9,694)	(534)	(7,390)
Total assets	2,562,437		2,562,437		$ 2,621,787
Steel Processing
Segment Reporting Information [Line Items]
Net sales	635,043	538,390	1,295,530	1,081,881
Operating income (loss)	25,016	41,130	64,676	74,002
Restructuring and other expense (income), net		(10,335)	(9)	(10,056)
Total assets	963,717		963,717		999,238
Pressure Cylinders
Segment Reporting Information [Line Items]
Net sales	294,447	300,862	594,800	570,673
Operating income (loss)	14,758	24,675	29,491	35,133
Impairment of goodwill and long-lived assets		964	2,381	964
Restructuring and other expense (income), net	402	488	(525)	2,365
Total assets	1,128,656		1,128,656		1,147,268
Engineered Cabs
Segment Reporting Information [Line Items]
Net sales	28,729	30,404	55,981	62,350
Operating income (loss)	(3,371)	(1,587)	(7,682)	(1,948)
Restructuring and other expense (income), net		(82)		(78)
Total assets	66,590		66,590		66,456
Other
Segment Reporting Information [Line Items]
Net sales	7	1,610	22	4,599
Operating income (loss)	(539)	(12,159)	290	(12,903)
Impairment of goodwill and long-lived assets		7,325		7,325
Restructuring and other expense (income), net		$ 235		$ 379
Total assets	$ 403,474		$ 403,474		$ 408,825

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Schedule of Fair Value of Derivative Instruments (Detail) - USD ($) $ in Thousands	Nov. 30, 2018	May 31, 2018
Derivative [Line Items]
Asset Derivatives at Fair Value	$ 982	$ 11,423
Liability Derivatives at Fair Value	2,998	846
Derivatives Designated As Hedging Instruments
Derivative [Line Items]
Asset Derivatives at Fair Value		6,453
Liability Derivatives at Fair Value	1,645
Derivatives Designated As Hedging Instruments | Commodity Contracts | Accounts Payable
Derivative [Line Items]
Liability Derivatives at Fair Value	1,560
Derivatives Designated As Hedging Instruments | Commodity Contracts | Receivables
Derivative [Line Items]
Asset Derivatives at Fair Value		6,385
Derivatives Designated As Hedging Instruments | Commodity Contracts | Other Assets
Derivative [Line Items]
Asset Derivatives at Fair Value		68
Derivatives Designated As Hedging Instruments | Commodity Contracts | Other Liabilities
Derivative [Line Items]
Liability Derivatives at Fair Value	85
Derivatives Not Designated As Hedging Instruments
Derivative [Line Items]
Asset Derivatives at Fair Value	982	4,970
Liability Derivatives at Fair Value	1,353	846
Derivatives Not Designated As Hedging Instruments | Commodity Contracts
Derivative [Line Items]
Asset Derivatives at Fair Value	982	4,970
Liability Derivatives at Fair Value	1,317	771
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Accounts Payable
Derivative [Line Items]
Liability Derivatives at Fair Value	1,167	613
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Receivables
Derivative [Line Items]
Asset Derivatives at Fair Value	890	4,749
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Other Assets
Derivative [Line Items]
Asset Derivatives at Fair Value	92	221
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Other Liabilities
Derivative [Line Items]
Liability Derivatives at Fair Value	150	158
Derivatives Not Designated As Hedging Instruments | Foreign Currency Exchange Contracts | Accounts Payable
Derivative [Line Items]
Liability Derivatives at Fair Value	$ 36	$ 75

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Nov. 30, 2018	May 31, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Impact to fair value of derivative assets and liabilities as a result of recognition on a net basis	$ 961	$ 351
Losses in accumulated other comprehensive income expected to be reclassified into net earnings	765
Losses in accumulated other comprehensive income expected to be reclassified into net earnings, tax	$ 229

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities - Schedule of Summary of Derivative Hedges (Detail) $ in Thousands	6 Months Ended
	Nov. 30, 2018USD ($)
Commodity Contracts | Minimum | Derivatives Not Designated As Hedging Instruments
Derivative [Line Items]
Notional Amount	$ 10,513
Maturity Date	2018-12
Commodity Contracts | Maximum | Derivatives Not Designated As Hedging Instruments
Derivative [Line Items]
Maturity Date	2020-04
Foreign Currency Exchange Contracts | Minimum | Derivatives Not Designated As Hedging Instruments
Derivative [Line Items]
Notional Amount	$ 5,030
Maturity Date	2018-12
Foreign Currency Exchange Contracts | Maximum | Derivatives Not Designated As Hedging Instruments
Derivative [Line Items]
Maturity Date	2019-05
Cash Flow Hedges | Commodity Contracts | Minimum
Derivative [Line Items]
Notional Amount	$ 22,067
Maturity Date	2018-12
Cash Flow Hedges | Commodity Contracts | Maximum
Derivative [Line Items]
Maturity Date	2019-12

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities - Schedule of Derivatives Designated as Cash Flow Hedging Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Derivative [Line Items]
Gain (Loss) Recognized in OCI (Effective Portion)	$ (4,499)	$ 2,114	$ (4,530)	$ 8,912
Gain (Loss) Reclassified from AOCI (Effective Portion)	1,567	5,609	4,063	9,414
Commodity Contracts
Derivative [Line Items]
Gain (Loss) Recognized in OCI (Effective Portion)	(4,499)	2,080	(4,530)	5,814
Commodity Contracts | Cost of Sales
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI (Effective Portion)	1,565	5,637	4,108	9,805
Interest Rate Contracts
Derivative [Line Items]
Gain (Loss) Recognized in OCI (Effective Portion)		34		3,098
Interest Rate Contracts | Interest Expense
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI (Effective Portion)	(34)	$ (28)	(81)	$ (391)
Foreign Currency Exchange Contracts | Miscellaneous Income, Net
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI (Effective Portion)	$ 36		$ 36

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities - Schedule of Gain (Loss) Recognized in Earnings for Economic (Non-Designated) Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Derivative [Line Items]
Gain (Loss) Recognized in Earnings	$ (1,920)	$ (67)	$ (5,623)	$ 2,059
Commodity Contracts | Cost of Sales
Derivative [Line Items]
Gain (Loss) Recognized in Earnings	(737)	(86)	(2,934)	2,248
Foreign Currency Exchange Contracts | Miscellaneous Income, Net
Derivative [Line Items]
Gain (Loss) Recognized in Earnings	$ (1,183)	$ 19	$ (2,689)	$ (189)

Fair Value - Schedule of Assets

Fair Value - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands		Nov. 30, 2018	May 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets		$ 982	$ 11,423
Liabilities		2,998	846
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets		982	11,423
Liabilities		2,998	846
Derivative Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	[1]	982	11,423
Liabilities	[1]	2,998	846
Derivative Instruments | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	[1]	982	11,423
Liabilities	[1]	$ 2,998	$ 846
[1]	The fair value of our derivative instruments is based on the present value of the expected future cash flows considering the risks involved, including non-performance risk, and using discount rates appropriate for the respective maturities. Market observable, Level 2 inputs are used to determine the present value of the expected future cash flows. Refer to “NOTE O – Derivative Instruments and Hedging Activities” for additional information regarding our use of derivative instruments.

Fair Value - Additional Informa

Fair Value - Additional Information (Detail) - USD ($)	Nov. 30, 2018	May 31, 2018
Long-term Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt at fair value including current maturities	$ 737,341,000	$ 757,069,000
Long-term debt at carrying amount including current maturities	749,779,000	750,368,000
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset measured at fair value on non-recurring basis	0	$ 30,000,000
Liabilities measured at fair value on non-recurring basis	$ 0

Fair Value - Assets Measured at

Fair Value - Assets Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value, Measurements, Nonrecurring - USD ($)	Nov. 30, 2018	May 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset measured at fair value on non-recurring basis	$ 0	$ 30,000,000
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset measured at fair value on non-recurring basis		30,000,000
Long Lived Assets Held And Used
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset measured at fair value on non-recurring basis		30,000,000
Long Lived Assets Held And Used | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset measured at fair value on non-recurring basis		$ 30,000,000

Fair Value - Assets Measured _2

Fair Value - Assets Measured at Fair Value on Non-Recurring Basis (Parenthetical) (Detail) - USD ($)	3 Months Ended			6 Months Ended
	Aug. 31, 2018	May 31, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of long-lived assets			$ 8,289,000	$ 2,381,000	$ 8,289,000
Oil And Gas Equipment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of long-lived assets		$ 10,497,000
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset measured at fair value on non-recurring basis		30,000,000		$ 0
Fair Value, Measurements, Nonrecurring | Oil And Gas Equipment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset measured at fair value on non-recurring basis		21,000,000
Worthington Aritas
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of long-lived assets	$ 2,381,000	42,422,000
Worthington Aritas | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset measured at fair value on non-recurring basis	$ 7,000,000	$ 9,000,000

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Subsequent Event [Line Items]
Proceeds from sale of assets		$ 170	$ 16,312	$ 20,447	$ 16,739
Subsequent Event | Lincoln Electric Holdings, Inc. | Brazing Assets Purchase Agreement
Subsequent Event [Line Items]
Proceeds from sale of assets	$ 1,900
Subsequent Event | Lincoln Electric Holdings, Inc. | Pressure Cylinders
Subsequent Event [Line Items]
Proceeds from sale of assets	$ 26,500