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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

Name:	us-gaap_MovementInValuationAllowancesAndReservesRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Amount of valuation and qualifying accounts and reserves.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Name:	us-gaap_ValuationAllowancesAndReservesBalance
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense.

Name:	us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Amount of decrease in valuation and qualifying accounts and reserves.