Description of Business and Summary of Significant Accounting Policies (Details)	6 Months Ended
Sep. 30, 2012
Minimum
Warranty
Warranty period	1 year
Minimum \| Property and equipment
Property and Equipment
Useful life	3 years
Maximum
Significant accounting policies
Expected period for unbilled amounts to be billed and collected	12 months
Expected period for unearned amounts to be earned	12 months
Warranty
Warranty period	3 years
Maximum \| Property and equipment
Property and Equipment
Useful life	8 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