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Commitment and Contingencies (Arbitral Award for the Taking of the Company's Venezuelan Operations) - Additional Information (Detail) - Compensatory Purposes - VENEZUELA - USD ($) $ in Millions		6 Months Ended
	Mar. 13, 2015	Sep. 30, 2016
Commitments and Contingencies Disclosure [Line Items]
Compensation awarded to the subsidiaries		$ 67.1
Compensation awarded to the subsidiaries, annual compound interest rate	4.50%
Portion of compensation awarded to the subsidiaries		38.2
Remaining balance of compensation awarded to the subsidiaries		28.9
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		$ 18.2
Legal And Other Settlements
Commitments and Contingencies Disclosure [Line Items]
Compensation awarded to the subsidiaries	$ 2.5

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