Business Combinations (Details)	3 Months Ended	6 Months Ended
Sep. 30, 2012	Sep. 30, 2012
Business Acquisition [Line Items]
Number of businesses acquired	1	1

The number of businesses acquired by the entity during the period.

No definition available.

Name:	us-gaap_NumberOfBusinessesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration