Discontinued Operations (Income (Loss) From Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011	Oct. 31, 2010
Discontinued Operations [Abstract]
Revenues	$ 199,042	$ 203,088	$ 365,928	$ 378,109
Income (loss) from operations before impairment and income tax benefit	(22,949)	5,708	(18,472)	327
Impairment of goodwill			(99,697)
Pretax income (loss)	(22,949)	5,708	(118,169)	327
Income tax expense (benefit)	(4,238)	3,313	(43,515)	805
Net income (loss) from discontinued operations	$ (18,711)	$ 2,395	$ (74,654)	$ (478)

Disposal Group Including Discontinued Operation Impairment On Goodwill.

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- Definition

Pretax gain (loss), not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.

+ References

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-Publisher FASB

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- Definition

Amount of gross profit attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of operating income or loss attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 47

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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The sum of current income tax expense or benefit and deferred income tax expense or benefit pertaining to continuing operations, tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items, and tax effect of gains and losses from events or transactions meeting the criteria to be classified as an extraordinary item.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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