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Number of shares that have been repurchased and retired during the period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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- Definition

Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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Accumulated Stockholders' Equity (Deficit) (Details) (USD $) Share data in Millions, unless otherwise specified	1 Months Ended	6 Months Ended
	Aug. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
2014 Share Repurchase Program
Share repurchase program
Amount of shares authorized to be repurchased	$ 1,000,000,000
Term of share repurchase program	3 years
Common stock shares repurchased and retired (in shares)		2.1
Cost of repurchase and retirement of common stock		67,500,000
2013 Share Repurchase Program
Share repurchase program
Common stock shares repurchased and retired (in shares)			4.5
Cost of repurchase and retirement of common stock			$ 125,600,000