| Report Element Information |
| Run date/time: 6/5/2011 7:34:39 AM |
| Report Element Attributes: |
| Report element from taxonomy prefix: | dei |
| DEI taxonomy standard label: | dei: Document Period End Date |
| Filer taxonomy standard label: | Document Period End Date |
| Documentation: | The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. |
| Balance type: | |
| Period type: | For Period (duration) |
| Report element type: | [Concept] |
| Data type: | Date (xbrli:dateItemType) |
| ID: | dei_DocumentPeriodEndDate |
| Name: | dei:DocumentPeriodEndDate |
| Labels of Report Element: (Labels from filer taxonomy, does not include other labels) |
| Role: | Label | Lang |
| Standard label (http://www.xbrl.org/2003/role/label) | Document Period End Date | en-US |
| References of Report Element, FASB Accounting Standards Codification: |
| Publisher, Name: | Topic | Sub Topic | Glossary | URI |
| References of Report Element, SEC Regulation S-X (SX): |
| Publisher, Name: | Number | Section | Paragraph | Subparagraph | Article |
| References of Report Element, US GAAP Legacy: |
| Publisher: | Name | Number | Chapter | Section | Paragraph | Subparagraph | Article | Clause | Appendix |