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Commitment and Contingencies (Aribitral Award for the Taking of the Company's Venezuelan Operations) - Additional Information (Detail) - Compensatory Purposes - VENEZUELA $ in Millions	6 Months Ended
	Sep. 30, 2015 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Compensation awarded to the subsidiaries	$ 64.3
Compensation awarded to the subsidiaries, annual compound interest rate	4.50%
Principal Investments
Commitments and Contingencies Disclosure [Line Items]
Compensation awarded to the subsidiaries	$ 46.4
Net Interest Settlements
Commitments and Contingencies Disclosure [Line Items]
Compensation awarded to the subsidiaries	15.4
Legal And Other Settlements
Commitments and Contingencies Disclosure [Line Items]
Compensation awarded to the subsidiaries	$ 2.5

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