Special Charges (Details) (USD $) In Millions	3 Months Ended	6 Months Ended
Sep. 30, 2010	Sep. 30, 2010
Notes to Financial Statements [Abstract]
Office closing and severance related costs associated with the acquisition of SST	$ 0.6	$ 1.0

Expenses charged against earnings in the period of an event that is infrequent in occurrence or unusual in nature.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 20

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6365513&loc=d3e15122-107781

Name:	us-gaap_OtherNonrecurringExpense
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration