CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013
Operating activities
Net earnings	$ 31,455us-gaap_ProfitLoss	$ 28,340us-gaap_ProfitLoss	$ 80,275us-gaap_ProfitLoss	$ 84,693us-gaap_ProfitLoss
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	21,200us-gaap_DepreciationAndAmortization	20,095us-gaap_DepreciationAndAmortization	41,567us-gaap_DepreciationAndAmortization	39,555us-gaap_DepreciationAndAmortization
Impairment of long-lived assets	14,235us-gaap_AssetImpairmentCharges	30,734us-gaap_AssetImpairmentCharges	16,185us-gaap_AssetImpairmentCharges	35,375us-gaap_AssetImpairmentCharges
Provision for deferred income taxes	(5,492)us-gaap_DeferredIncomeTaxExpenseBenefit	(13,110)us-gaap_DeferredIncomeTaxExpenseBenefit	(6,027)us-gaap_DeferredIncomeTaxExpenseBenefit	(21,534)us-gaap_DeferredIncomeTaxExpenseBenefit
Bad debt expense (income)	143us-gaap_ProvisionForDoubtfulAccounts	185us-gaap_ProvisionForDoubtfulAccounts	(60)us-gaap_ProvisionForDoubtfulAccounts	(296)us-gaap_ProvisionForDoubtfulAccounts
Equity in net income of unconsolidated affiliates, net of distributions	(813)	(3,506)	(7,803)	(9,421)
Net loss (gain) on sale of assets and insurance	2,370us-gaap_GainLossOnDispositionOfAssets1	(7,188)us-gaap_GainLossOnDispositionOfAssets1	(460)us-gaap_GainLossOnDispositionOfAssets1	(11,850)us-gaap_GainLossOnDispositionOfAssets1
Stock-based compensation	4,498	4,722	8,853	8,502
Excess tax benefits - stock-based compensation	(621)	(1,534)	(5,753)	(5,832)
Gain on previously held interest in TWB				(11,000)
Changes in assets and liabilities, net of impact of acquisitions:
Receivables	(6,916)us-gaap_IncreaseDecreaseInReceivables	7,574us-gaap_IncreaseDecreaseInReceivables	5,836us-gaap_IncreaseDecreaseInReceivables	15,229us-gaap_IncreaseDecreaseInReceivables
Inventories	16,087us-gaap_IncreaseDecreaseInInventories	(21,838)us-gaap_IncreaseDecreaseInInventories	(35,130)us-gaap_IncreaseDecreaseInInventories	(21,323)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	(5,232)	4,072	(8,104)	1,707
Other assets	3,095	139	3,216	575
Accounts payable and accrued expenses	(72,095)	(23,922)	(30,205)	16,700
Other liabilities	(505)	4,556	(6,496)	2,703
Net cash provided by operating activities	1,409	29,319	55,894	123,783
Investing activities
Investment in property, plant and equipment	(23,273)	(17,060)	(47,146)	(30,414)
Investment in notes receivable	(2,300)		(7,300)
Acquisitions, net of cash acquired	(14,543)	276	(51,093)	53,233
Distributions from (investments in) unconsolidated affiliates	129	3,668	(3,671)	9,223
Proceeds from sale of assets and insurance	921	16,086	1,186	23,733
Net cash provided (used) by investing activities	(39,066)	2,970	(108,024)	55,775
Financing activities
Net proceeds from (repayments of) short-term borrowings	(196)	(18,736)	359	(70,277)
Proceeds from long-term debt	20,480		20,480
Principal payments on long-term debt	(511)us-gaap_RepaymentsOfLongTermDebt	(285)us-gaap_RepaymentsOfLongTermDebt	(813)us-gaap_RepaymentsOfLongTermDebt	(569)us-gaap_RepaymentsOfLongTermDebt
Proceeds from (payments for) issuance of common shares	566	4,286	(454)	6,487
Excess tax benefits - stock-based compensation	621	1,534	5,753	5,832
Payments to noncontrolling interest		(875)	(2,867)	(2,638)
Repurchase of common shares	(21,549)	(19,800)	(41,620)	(50,316)
Dividends paid	(12,138)us-gaap_PaymentsOfDividends	(10,407)us-gaap_PaymentsOfDividends	(22,250)us-gaap_PaymentsOfDividends	(10,407)us-gaap_PaymentsOfDividends
Net cash used by financing activities	(12,727)	(44,283)	(41,412)	(121,888)
Increase (decrease) in cash and cash equivalents	(50,384)	(11,994)	(93,542)	57,670
Cash and cash equivalents at beginning of period	146,921	121,049	190,079	51,385
Cash and cash equivalents at end of period	$ 96,537	$ 109,055	$ 96,537	$ 109,055

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The cash outflow to acquire an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities.

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No definition available.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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