Income Taxes (Details) (USD $) In Thousands	Apr. 30, 2011	Apr. 30, 2010
Deferred tax liabilities:
Intangible assets	$ 1,025,301	$ 1,042,375
Property, plant, and equipment	111,537	121,950
Other	10,016	22,042
Total deferred tax liability	1,146,854	1,186,367
Deferred tax assets:
Post-employment and other employee benefits	84,723	69,887
Tax credit and loss carryforwards	4,583	5,049
Intangible assets	3,279	3,984
Other	27,668	21,247
Total deferred tax assets	120,253	100,167
Valuation allowance for deferred tax assets	(3,324)	(3,470)
Total deferred tax assets less allowance	116,929	96,697
Net deferred tax liability	$ 1,029,925	$ 1,089,670

The cumulative amount of the estimated future tax effects attributable to the difference between the tax basis of goodwill and intangible assets and the basis of goodwill and intangible assets computed in accordance with generally accepted accounting principles. The difference in basis, whether due to amortization or other reasons, will decrease future taxable income when such difference reverses.

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Deferred tax assets Tax credit and loss carryforwards

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The sum of the tax effects as of the balance sheet date of the amounts of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws ( before the valuation allowance, if any, to reduce such sum amount to net realizable value). Includes any tax benefit realized in deferred tax assets for significant impacts of tax planning strategies.

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The tax effect as of the balance sheet date of the amount of estimated future tax deductions arising from other temporary differences not otherwise specified in the taxonomy.

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The sum of the tax effects as of the balance sheet date of the amount of the estimated future tax deductions arising from all employee compensation and benefits costs, which can only be deducted for tax purposes when the actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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The sum of the portions of deferred tax assets as of the balance sheet date for which, based on the weight of available evidence, it is more likely than not will not be realized through future reductions of tax-based income.

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The cumulative amount of all deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A taxable temporary difference is a difference between the tax basis and the carrying amount of an asset or liability in the financial statements prepared in accordance with generally accepted accounting principles that will result in taxable amounts in one or more future periods.

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The cumulative amount of the estimated future tax effects attributable to other temporary differences not otherwise specified in this taxonomy that were expensed for tax purposes but capitalized in conformity with generally accepted accounting principles, or which were recognized as revenue under GAAP but not for tax purposes, which will reverse in future periods.

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The amount as of the balance sheet date of the estimated future tax effects attributable to the difference between the tax basis of capital assets and the basis of capital assets computed in accordance with generally accepted accounting principles. The difference in basis, attributable to different capitalization of costs, depreciation, or amortization methodologies, will increase future taxable income when such basis difference is realized. Capital assets include but are not limited to assets such as land, real estate, leasehold improvements, machinery and equipment and furniture and fixtures.

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