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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, unless otherwise specified | 12 Months Ended
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May 31, 2014 | May 31, 2013 | May 31, 2012
Income Tax Rate Reconciliation [Line Items] |  |  |
Income tax expense (benefit) at the U.S. statutory federal income tax rate | $ 148,570 | $ 61,912 | $ 114,901
Impact of foreign operations | (24,874) | (11,552) | (32,192)
State and local income taxes net of federal income tax benefit | 4,519 | 1,979 | 4,073
Tax benefits from the domestic manufacturing deduction | (4,878) | (4,489) | (3,744)
Nondeductible fines and penalties | (2,002) | 4,802 |
Nondeductible business expense | 1,508 | 1,269 | 1,304
Valuation allowance | (2,998) | 14,729 | 9,353
Other | (1,342) | (1,610) | 831
Provision for Income Tax Expense | $ 118,503 | $ 67,040 | $ 94,526
Effective Income Tax Rate | 27.90% | 37.90% | 28.80%

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