Useful Lives of Property and Equipment (Detail)	3 Months Ended
Jun. 30, 2012
Buildings \| Minimum
Property, Plant and Equipment [Line Items]
Useful lives of property and equipment	30 years
Buildings \| Maximum
Property, Plant and Equipment [Line Items]
Useful lives of property and equipment	35 years
Machinery, equipment and automobiles \| Minimum
Property, Plant and Equipment [Line Items]
Useful lives of property and equipment	7 years
Machinery, equipment and automobiles \| Maximum
Property, Plant and Equipment [Line Items]
Useful lives of property and equipment	15 years

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration