Description of Business and Summary of Significant Accounting Policies - Schedule of Property, Plant and Equipment (Detail)	12 Months Ended
	Mar. 31, 2013
Building [Member] | Maximum [Member]
Depreciation and Amortization Expenses For Property Plant And Equipment [Line Items]
Estimated useful lives of property and equipment	39 years 6 months
Building and land improvements [Member] | Minimum [Member]
Depreciation and Amortization Expenses For Property Plant And Equipment [Line Items]
Estimated useful lives of property and equipment	5 years
Building and land improvements [Member] | Maximum [Member]
Depreciation and Amortization Expenses For Property Plant And Equipment [Line Items]
Estimated useful lives of property and equipment	15 years
Other property and equipment [Member] | Minimum [Member]
Depreciation and Amortization Expenses For Property Plant And Equipment [Line Items]
Estimated useful lives of property and equipment	2 years
Other property and equipment [Member] | Maximum [Member]
Depreciation and Amortization Expenses For Property Plant And Equipment [Line Items]
Estimated useful lives of property and equipment	5 years