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Valuation and Qualifying Accounts and Reserves (Detail) - USD ($) $ in Thousands | 12 Months Ended
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May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Allowance for Doubtful Accounts, Current |  |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |
Balance at beginning of Period |  | $ 27,641 |  | $ 28,904 |  | $ 26,507 |
Charged to Selling, General and Administrative |  | 4,929 |  | 7,618 |  | 9,799 |
Acquisitions (Disposals) of Businesses and Reclassifications |  | 1,715 |  |  |  |  |
(Deductions) Additions | [1] | (9,759) |  | (8,881) |  | (7,402) |
Balance at End of Period |  | 24,526 |  | 27,641 |  | 28,904 |
Accrued product liability reserves |  |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |
Balance at beginning of Period |  | 10,589 |  | 15,582 |  | 11,736 |
Charged to Selling, General and Administrative |  | 1,151 |  | 3,186 |  | 5,499 |
Acquisitions (Disposals) of Businesses and Reclassifications |  | 579 |  |  |  |  |
(Deductions) Additions | [2] | (403) |  | (8,179) |  | (1,653) |
Balance at End of Period |  | 11,916 |  | 10,589 |  | 15,582 |
Accrued Loss Reserves [Member] |  |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |
Balance at beginning of Period |  | 2,731 |  | 3,418 |  | 3,580 |
Charged to Selling, General and Administrative |  | 937 |  | 275 |  | 195 |
Acquisitions (Disposals) of Businesses and Reclassifications |  | 1,113 | [3] | 494 | [4] | 227 | [3]
(Deductions) Additions | [2] | (3,398) |  | (1,456) |  | (584) |
Balance at End of Period |  | 1,383 |  | 2,731 |  | 3,418 |
Accrued warranty reserves |  |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |
Balance at beginning of Period |  | 29,653 |  | 29,489 |  | 28,592 |
Charged to Selling, General and Administrative |  | 10,034 |  | 4,968 |  | 7,653 |
(Deductions) Additions |  | (9,919) | [5] | (4,804) | [2] | (6,756) | [2]
Balance at End of Period |  | 29,768 |  | 29,653 |  | 29,489 |
Accrued environmental reserves |  |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |
Balance at beginning of Period |  | 2,005 |  | 3,274 |  | 3,952 |
Charged to Selling, General and Administrative |  | 1,715 |  |  |  | (60) |
Acquisitions (Disposals) of Businesses and Reclassifications | [3] | 1,370 |  | (494) |  | (227) |
(Deductions) Additions | [2] | (1,592) |  | (775) |  | (391) |
Balance at End of Period |  | $ 3,498 |  | $ 2,005 |  | $ 3,274 |
[1] | Uncollectible accounts written off, net of recoveries
[2] | Primarily claims paid during the year, net of insurance contributions
[3] | Primarily transfers between current and noncurrent
[4] | The $250.0 million aggregate principal amount of the notes due 2018 is adjusted for the amortization of the original issue discount, which approximated $1.0 million and $1.4 million at May 31, 2015 and 2014, respectively. The original issue discount effectively reduced the ultimate proceeds from the financing. The effective interest rate on the notes, including the amortization of the discount, is 6.704% for both years presented.
[5] | We entered into a cross-currency swap, which fixed the interest and principal payments in euros, resulting in an effective fixed-rate borrowing of 5.31%. Pursuant to the Redemption Notice issued to the holders thereof by the Company on April 28, 2015, the 6.70% Senior Notes issued by RPM United Kingdom G.P., which were due to mature on November 1, 2015, were redeemed on May 29, 2015.

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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