| Report Element Information |
| Run date/time: 6/5/2011 7:34:42 AM |
| Report Element Attributes: |
| Report element from taxonomy prefix: | us-gaap |
| US GAAP taxonomy standard label: | us-gaap: Treasury Stock, Restrictions |
| Filer taxonomy standard label: | Treasury Stock, Restrictions |
| Documentation: | This element represents a description of restrictions imposed by state laws on the entity's acquisition of its own [treasury] stock and the accounting treatment required to be applied in compliance with such restrictions. The information represented by this element does not include restrictions on the payment of dividends. |
| Balance type: | |
| Period type: | For Period (duration) |
| Report element type: | [Concept] |
| Data type: | Text/String (xbrli:stringItemType) |
| ID: | us-gaap_TreasuryStockRestrictions |
| Name: | us-gaap:TreasuryStockRestrictions |
| 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) | Treasury Stock, Restrictions | en-US |
| References of Report Element, FASB Accounting Standards Codification: |
| Publisher, Name: | Topic | Sub Topic | Glossary | URI |
| FASB, Accounting Standards Codification | 505 | 30 | http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 |
| 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 |
| AICPA | Accounting Research Bulletin (ARB) | 43 | 1 | B | 11A | ||||
| AICPA | Accounting Principles Board Opinion (APB) | 43 | 1 | B | 13 |