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CONSOLIDATED BALANCE SHEETS (Parenthetical) (CHF)
Mar. 31, 2015
Mar. 31, 2014
Statement of Financial Position [Abstract]    
Shares, par value (in CHF per share) 0.25us-gaap_CommonStockParOrStatedValuePerShare 0.25us-gaap_CommonStockParOrStatedValuePerShare
Issued shares 173,106,000us-gaap_CommonStockSharesIssued 173,106,000us-gaap_CommonStockSharesIssued
Authorized shares 173,106,000us-gaap_CommonStockSharesAuthorized 173,106,000us-gaap_CommonStockSharesAuthorized
Conditionally authorized shares 50,000,000logi_SharesConditionallyAuthorized 50,000,000logi_SharesConditionallyAuthorized
Treasury shares (in shares) 8,625,000us-gaap_TreasuryStockShares 10,206,000us-gaap_TreasuryStockShares