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Incentive Award Plan and Employee Stock Purchase Plan (Details) (USD $) In Millions, except Share data, unless otherwise specified |  | 0 Months Ended |  |  |  |  | 0 Months Ended
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Sep. 30, 2012 | Sep. 30, 2012 2010 Employee Stock Purchase Plan (ESPP) | Mar. 31, 2012 2010 Employee Stock Purchase Plan (ESPP) | Jun. 03, 2010 Chief Executive Officer Market Based Award | Mar. 08, 2011 Chief Executive Officer Performance Based Award | Mar. 23, 2012 Chief Executive Officer Performance Based Award | Jun. 03, 2010 Chief Executive Officer Performance Based Award | Mar. 31, 2012 Other Executive Officers component | Mar. 31, 2012 Other Executive Officers Performance Based Award | May 15, 2012 Other Executive Officers Apex Systems component | May 15, 2012 Other Executive Officers Apex Systems Performance Based Award | May 15, 2012 Company Employees Apex Systems installment | Mar. 05, 2012 Restricted Stock Units (RSUs) Chief Executive Officer Performance Based Award component | Jan. 03, 2012 Restricted Stock Units (RSUs) Chief Executive Officer Performance Based Award
Deferred Compensation Arrangement with Individual, Share-based Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based awards, grant date fair market value |  |  |  | $ 0.5 | $ 1.0 | $ 1.5 | $ 0.5 | $ 1.7 |  | $ 0.8 |  | $ 12.3 | $ 0.6 | $ 0.8
Share-based awards expense, service period |  |  |  | 2 years 7 months 6 days | 9 months 27 days 9 hours |  |  |  |  |  |  |  |  |
Liability for share-based awards | 2.5 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based awards, grants in period |  |  |  |  |  |  |  |  |  |  |  | 760,788 | 45,372 | 72,596
Share-based awards, number of equal vesting components |  |  |  |  |  |  |  | 3 |  | 3 |  |  | 2 |
Share-based awards, amount of equal vesting components |  |  |  |  |  |  |  | 0.9 |  | 0.6 |  |  | 0.3 |
Share-based awards, amount of final vesting component |  |  |  |  |  |  |  |  | $ 0.8 |  | $ 0.2 |  |  |
Employee stock purchase plan shares issued during period |  | 46,770 | 108,164 |  |  |  |  |  |  |  |  |  |  |
Share-based awards, vesting percentage in year one |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |
Share-based awards, number of quarterly vesting installments |  |  |  |  |  |  |  |  |  |  |  | 12 |  |

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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 6, 7 -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. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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