Restatement and Revision of Previously Issued Consolidated Financial Statements (Details 4)	Mar. 31, 2014 USD ($)	Mar. 31, 2014 CHF	Mar. 31, 2013 USD ($)	Mar. 31, 2012 USD ($)	Mar. 31, 2011 USD ($)	Mar. 31, 2011 Property Plant and Equipment Capitalization Threshold Convention USD ($)	Mar. 31, 2013 As Reported USD ($)	Mar. 31, 2012 As Reported USD ($)	Mar. 31, 2011 As Reported USD ($)	Mar. 31, 2011 Adjustments USD ($)	Mar. 31, 2013 Adjustments Amounts not properly stated USD ($)	Mar. 31, 2013 Adjustments Property Plant and Equipment Capitalization Threshold Convention USD ($)	Mar. 31, 2013 Adjustments Other adjustments USD ($)
Current assets:
Cash and cash equivalents	$ 469,412,000		$ 333,824,000	$ 478,370,000	$ 477,931,000		$ 333,824,000	$ 478,370,000	$ 477,931,000
Accounts receivable, net	182,029,000		178,959,000				179,565,000						(606,000)
Inventories	222,402,000		262,644,000				261,083,000						1,561,000
Other current assets	59,157,000		60,377,000				58,103,000						2,274,000
Assets held for sale			10,960,000				10,960,000
Total current assets	933,000,000		846,764,000				843,535,000				3,229,000
Non-current assets:
Property, plant and equipment, net	88,391,000		93,721,000				87,649,000					7,034,000	(962,000)
Goodwill	345,010,000		341,357,000	560,523,000			341,357,000
Other intangible assets	10,529,000		26,024,000				26,024,000
Other assets	74,460,000		74,467,000				75,098,000						(631,000)
Total assets	1,451,390,000		1,382,333,000				1,373,663,000				8,670,000
Current liabilities:
Accounts payable	242,815,000		265,405,000				265,995,000						(590,000)
Accrued and other current liabilities	211,972,000		193,084,000				192,774,000						310,000
Liabilities held for sale			3,202,000				3,202,000
Total current liabilities	454,787,000		461,691,000				461,971,000				(280,000)
Non-current liabilities:
Income taxes payable	93,126,000		98,827,000				98,827,000
Other non-current liabilities	99,349,000		99,862,000				97,055,000						2,807,000
Total liabilities	647,262,000		660,380,000				657,853,000				2,527,000
Commitments and contingencies
Shareholders' equity:
Registered shares, CHF 0.25 par value: Issued and authorized shares - 173,106 at March 31, 2013 Conditionally authorized shares - 50,000 at March 31, 2013	30,148,000	43,276,655	30,148,000				30,148,000
Less: shares in treasury, at cost, 13,855 at March 31, 2013	(116,510,000)		(179,990,000)				(177,847,000)						(2,143,000)
Retained earnings	976,292,000		966,924,000			(8,300,000)	956,502,000					7,034,000	3,388,000
Accumulated other comprehensive loss	(85,802,000)		(95,129,000)				(92,993,000)						(2,136,000)
Total shareholders' equity	804,128,000		721,953,000	1,131,791,000	1,157,874,000		715,810,000		1,179,762,000	(21,888,000)	6,143,000
Total liabilities and shareholders' equity	$ 1,451,390,000		$ 1,382,333,000				$ 1,373,663,000				$ 8,670,000