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| 0001193125-13-243261-index.html | 2013-05-31 16:05:22 | |
| 0001193125-13-243261.txt | 2013-05-31 16:05:22 | |
 0001193125-13-243261-xbrl.zip | 57508 | 2013-05-31 16:05:22 |
| chs-20130504.xml | 859091 | 2013-05-31 16:05:22 |
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| d511442dex322.htm | 4076 | 2013-05-31 16:05:22 |
| FilingSummary.xml | 10804 | 2013-05-31 16:05:22 |
| Financial_Report.xls | 830842 | 2013-05-31 16:05:22 |
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| R10.htm | 233141 | 2013-05-31 16:05:22 |
| R11.htm | 6092 | 2013-05-31 16:05:22 |
| R12.htm | 132482 | 2013-05-31 16:05:22 |
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| R14.htm | 216766 | 2013-05-31 16:05:22 |
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