Stock-Based Compensation - Stock Incentive Plan (Narratives) (Details) - 2013 Plan	Apr. 30, 2013 shares
Stock-Based Compensation
Maximum number of shares available under the Plan	10,100,000
Stock options
Stock-Based Compensation
Number of shares counted by each award	1
Stock-settled award other than an option, stock appreciation right or award for which the recipient pays intrinsic value
Stock-Based Compensation
Number of shares counted by each award	1.75

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant