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Risks and contingencies (Details)	Jan. 30, 2015 lawsuit
Putative shareholder class action lawsuits filed
Risks and contingencies
Number of putative shareholder class action lawsuits filed	7

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The total number of new claims filed pertaining to a loss contingency during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 450



-SubTopic 20



-Section 50



-Paragraph 4



-Subparagraph (a)



-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

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