Summary of Significant Accounting Policies - Estimated Useful Life of Property, Plant and Equipment (Detail)	12 Months Ended
	Mar. 31, 2017
Buildings
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	40 years
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years, description	Shorter of the estimated useful life or the remaining lease term
Minimum | Process Upgrades to the Building
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	10 years
Minimum | Machinery and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	3 years
Minimum | Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	3 years
Maximum | Process Upgrades to the Building
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	40 years
Maximum | Machinery and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	10 years
Maximum | Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life in years	5 years