Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2017 segment shares
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents include all highly liquid investments with an original maturity, when purchased, in months	3 months
Number of geographical regions | segment	3
Restricted Stock and Restricted Stock Units
Summary Of Significant Accounting Policies [Line Items]
Percentage of restricted stock units granted, vested per year	25.00%
Vesting period, in years	4 years
Minimum
Summary Of Significant Accounting Policies [Line Items]
Percentage of investment ownership, consolidated	50.00%
Percentage of investment ownership, equity method	20.00%
Estimated useful lives of finite-lived assets	3 years
Market share units converted into common stock for each unit	0
Minimum | Reserve Power Batteries
Summary Of Significant Accounting Policies [Line Items]
Product warranty for a period	1 year
Minimum | Motive Power Batteries
Summary Of Significant Accounting Policies [Line Items]
Product warranty for a period	1 year
Minimum | Building and Improvements
Summary Of Significant Accounting Policies [Line Items]
Property, plant, and equipment, useful life	10 years
Minimum | Machinery and Equipment
Summary Of Significant Accounting Policies [Line Items]
Property, plant, and equipment, useful life	3 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Percentage of investment ownership, equity method	50.00%
Percentage of investment ownership, cost method	20.00%
Estimated useful lives of finite-lived assets	20 years
Market share units converted into common stock for each unit	2
Maximum | Reserve Power Batteries
Summary Of Significant Accounting Policies [Line Items]
Product warranty for a period	20 years
Maximum | Motive Power Batteries
Summary Of Significant Accounting Policies [Line Items]
Product warranty for a period	7 years
Maximum | Building and Improvements
Summary Of Significant Accounting Policies [Line Items]
Property, plant, and equipment, useful life	33 years
Maximum | Machinery and Equipment
Summary Of Significant Accounting Policies [Line Items]
Property, plant, and equipment, useful life	15 years