Financial Instruments (Notional Amounts At Contract Exchange Rates Of Foreign Currency Forward Contracts) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012
Derivative [Line Items]
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	$ 266.6	$ 322.0
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	180.9	178.0
Euro [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	180.9	214.2
Australian Dollar [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	31.8	29.9
Chinese Yuan Renminbi [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	14.9	11.7
Swiss Franc [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	9.5	6.8
Singapore Dollar [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	6.4	3.8
Brazilian Real [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	5.9	8.7
Danish Krone [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	4.9	3.9
South Korean Won [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	3.2	2.6
Norwegian Krone [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	2.8	2.9
New Zealand Dollar [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	2.5	3.4
British Pound [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)		19.2
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	3.2
Swedish krona [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	0.5	8.2
Mexican Peso [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)		3.2
Other [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	3.3	3.5
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	0.7	4.8
Israeli Shekel [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	165.0	158.2
Indian Rupee [Member]
Derivative [Line Items]
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	$ 12.0	$ 15.0