Financial Instruments (Notional Amounts At Contract Exchange Rates Of Foreign Currency Forward Contracts) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Mar. 31, 2012
Derivative [Line Items]
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	$ 158.7	$ 322.0
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	164.3	178.0
Euro [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	90.4	214.2
Australian Dollar [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	19.8	29.9
Chinese Yuan Renminbi [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	13.9	11.7
Swiss Franc [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	7.5	6.8
Singapore Dollar [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	5.6	3.8
New Zealand Dollar [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	5.0	3.4
Canadian dollar [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	3.8
South Korean Won [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	2.9	2.6
Danish Krone [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	2.7	3.9
Brazilian real [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	2.1	8.7
British Pound [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)		19.2
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	6.3
Swedish krona [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)		8.2
Mexican peso [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)		3.2
Other [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	5.0	6.4
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	0.5	4.8
Israeli Shekel [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	146.5	158.2
Indian Rupee [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	$ 11.0	$ 15.0