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Significant Components of Deferred Income Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | May 31, 2013 | May 31, 2012
--- | --- | ---
Deferred income tax assets related to: |  |
Inventories | $ 6,795 | $ 5,810
Allowance for losses | 7,584 | 8,935
Accrued compensation and benefits | 113,394 | 113,934
Accrued other expenses | 16,322 | 6,525
Other long-term liabilities | 29,954 | 25,280
Net operating loss and credit carryforwards | 70,208 | 76,740
Net unrealized loss on securities | 21,727 | 1,478
Total Deferred Income Tax Assets | 265,984 | 238,702
Less: valuation allowances | (89,909) | (75,167)
Net Deferred Income Tax Assets | 176,075 | 163,535
Deferred income tax (liabilities) related to: |  |
Depreciation | (48,491) | (47,872)
Pension and other postretirement benefits | (12,204) | (15,824)
Amortization of intangibles | (125,042) | (109,206)
Total Deferred Income Tax (Liabilities) | (185,737) | (172,902)
Deferred Income Tax Assets (Liabilities), Net | $ (9,662) | $ (9,367)

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