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Preferred and Common Stockholder's Equity - Summary of Common Shares Issued and Outstanding (Detail) - shares shares in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Equity [Abstract]
Common stock issued, Beginning balance	68.4	69.1	68.9
Common stock outstanding, Beginning balance	68.4	69.1	68.9
Common stock issued upon exercise of options and employee stock plans	2.2	0.9	4.7
Repurchase and retirement of common stock		(1.6)	(4.5)
Common stock issued, Ending balance	70.6	68.4	69.1
Common stock outstanding, Ending balance	70.6	68.4	69.1

X

- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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No definition available.

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

+ References

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

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