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Product Warranty Reserve - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Jun. 30, 2011
Product Warranties Disclosures [Abstract] |
Warranty reserve | $ 1.8

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Represents the aggregate increase in the liability for accruals related to standard and extended product warranties issued during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3)) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | duration