Loss Contingencies Arising From Representations And Warranties of Our Discontinued Mortgage Operations (Details) (USD $)	9 Months Ended
Jan. 31, 2015	Jan. 31, 2014	Apr. 30, 2014	Apr. 30, 2013
Loss Contingency Accrual [Roll Forward]
Provisions	$ 8,900,000	$ 20,900,000	$ 23,700,000
SCC [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Product Liability, Gross	143,765,000	158,765,000	183,765,000	158,765,000
Loss Contingency Accrual [Roll Forward]
Payments	(50,000,000)	0
Balance, end of the period	$ 10,000,000	$ 0

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Amount of loss contingency liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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Undiscounted amount of the accrual for damages arising from third-party use of the entity's product or process.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 5.Y.Q1)

-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section Y

-Paragraph Question 1

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- Definition

The amount of loss reported during the period pertaining to product liability.

+ References

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Represents the aggregate decrease in the liability related to payments to satisfy claims for standard and extended product warranties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(2))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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