Commitments and Contingencies Contingencies (Details) (USD $) In Millions, unless otherwise specified			12 Months Ended
Mar. 31, 2012 Pending or Threatened Litigation [Member]	Sep. 30, 2011 Pending or Threatened Litigation [Member]	Sep. 30, 2011 CHINA
Loss Contingencies [Line Items]
Revenue from China as a percent of total revenue, minimum			6.00%
Revenue from China as a percent of total revenue, maximum			7.00%
Loss contingency accrual	$ 0.4	$ 0.4

The carrying amount as of the balance sheet date of the combined total of loss contingency liabilities.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349

Name:	us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant