Notional Value and Aggregate Cumulative Unrealized Gains on Outstanding Contracts (Detail) (USD $) In Thousands	Jun. 30, 2011	Sep. 30, 2010
Derivative [Line Items]
Notional Value	$ 2,183	$ 17,596
Aggregate Cumulative Unrealized Gains	280	729
Canadian Dollars
Derivative [Line Items]
Notional Value	1,547	13,032
Aggregate Cumulative Unrealized Gains	125	286
Hungarian Forints
Derivative [Line Items]
Notional Value	636	4,564
Aggregate Cumulative Unrealized Gains	$ 155	$ 443

Aggregate notional amount of all foreign currency derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Notional Amount
-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959

Name:	us-gaap_NotionalAmountOfForeignCurrencyCashFlowHedgeDerivatives
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant