Guarantees, Commitments And Contingencies (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2007 ScheduledRentIncreases
Commitments And Contingencies Disclosure [Abstract]
Outstanding letters of credit, performance bonds and similar instruments	$ 50.3
Rent expense under various non-cancellable operating leases	48.9	44.4	53.0
Cash proceeds from sale of headquarters campus and three undeveloped land parcels, net of closing costs				291.9
Term of lease agreement in connection with the sale of the buildings				15 year
Deferred gain to be amortized over the lease term				24.2
Number of scheduled rent increases over the lease term				5
Capital lease obligations to procure certain equipment, current portion	8.4	7.6
Capital lease obligations to procure certain equipment, long-term portion	9.6	10.5
Capital lease obligation, future minimum payments to be made in 2014	8.6
Capital lease obligation, future minimum payments to be made in 2015	5.0
Capital lease obligation, future minimum payments to be made in 2016	3.2
Capital lease obligation, future minimum payments to be made in 2017	1.4
Capital lease obligation, future minimum payments to be made in 2018	0.1
Maximum estimated charge from litigation of foreign tax dispute	$ 11