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Reconciliation of Income Tax Expense (Benefit) Computed by Applying U.S. Statutory Federal Income Tax Rate against Income (Loss) before Income Taxes to Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
May. 31, 2015 | May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Income Tax Rate Reconciliation [Line Items] |  |  |  |
Income tax expense (benefit) at the U.S. statutory federal income tax rate |  | $ 158,638 | $ 148,570 | $ 61,912
Impact of foreign operations |  | (32,706) | (27,374) | (11,552)
State and local income taxes net of federal income tax benefit |  | 4,140 | 4,519 | 1,979
Tax benefits from the domestic manufacturing deduction |  |  | (4,878) | (4,489)
Nondeductible fines and penalties |  |  | (2,002) | 4,802
Nondeductible business expense |  | 1,782 | 1,508 | 1,269
Valuation allowance |  | (10,455) | (2,998) | 14,729
Unremitted foreign earnings | $ 106,227 | 106,227 | 2,500 |
Other |  | (2,701) | (1,342) | (1,610)
Provision for Income Taxes |  | $ 224,925 | $ 118,503 | $ 67,040
Effective Income Tax Rate |  | 49.60% | 27.90% | 37.90%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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