Derivative Instruments - Notional Amounts Outstanding under Foreign Currency Contracts (Detail) (Not Designated as Hedging Instrument, Foreign Exchange Contract, USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Sep. 30, 2013
Derivative [Line Items]
Fair Value of Assets	$ 15	$ 8
Fair Value of Liabilities	4	5
Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
Derivative [Line Items]
Fair Value of Assets	2	8
Fair Value of Liabilities	0	0
Buy Currency, British Pound; Sell Currency, Euro
Derivative [Line Items]
Fair Value of Assets	10
Fair Value of Liabilities	0
Buy Currency, U.S. Dollar; Sell Currency, Taiwan Dollar
Derivative [Line Items]
Fair Value of Assets	1
Fair Value of Liabilities	0
Buy Currency, Korean Won; Sell Currency, US Dollar
Derivative [Line Items]
Fair Value of Assets	0	0
Fair Value of Liabilities	1	2
Buy Currency, Euro; Sell Currency U.S. Dollar
Derivative [Line Items]
Fair Value of Assets	0
Fair Value of Liabilities	3
Buy Currency, U.S. Dollar; Sell Currency, Israeli Shekel
Derivative [Line Items]
Fair Value of Assets	2	0
Fair Value of Liabilities	0	3
Buy Currency, U.S. Dollar; Sell Currency, Singapore Dollar
Derivative [Line Items]
Fair Value of Assets		0
Fair Value of Liabilities		0
Long
Derivative [Line Items]
Notional Amount	10,768	3,988
Long | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
Derivative [Line Items]
Notional Amount	2,709	2,770
Long | Buy Currency, British Pound; Sell Currency, Euro
Derivative [Line Items]
Notional Amount	5,315
Long | Buy Currency, U.S. Dollar; Sell Currency, Taiwan Dollar
Derivative [Line Items]
Notional Amount	554
Long | Buy Currency, Korean Won; Sell Currency, US Dollar
Derivative [Line Items]
Notional Amount	559	686
Long | Buy Currency, Euro; Sell Currency U.S. Dollar
Derivative [Line Items]
Notional Amount	816
Long | Buy Currency, U.S. Dollar; Sell Currency, Israeli Shekel
Derivative [Line Items]
Notional Amount	815	301
Long | Buy Currency, U.S. Dollar; Sell Currency, Singapore Dollar
Derivative [Line Items]
Notional Amount		231
Short
Derivative [Line Items]
Notional Amount	10,757	3,985
Short | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
Derivative [Line Items]
Notional Amount	2,707	2,762
Short | Buy Currency, British Pound; Sell Currency, Euro
Derivative [Line Items]
Notional Amount	5,305
Short | Buy Currency, U.S. Dollar; Sell Currency, Taiwan Dollar
Derivative [Line Items]
Notional Amount	553
Short | Buy Currency, Korean Won; Sell Currency, US Dollar
Derivative [Line Items]
Notional Amount	560	688
Short | Buy Currency, Euro; Sell Currency U.S. Dollar
Derivative [Line Items]
Notional Amount	819
Short | Buy Currency, U.S. Dollar; Sell Currency, Israeli Shekel
Derivative [Line Items]
Notional Amount	813	304
Short | Buy Currency, U.S. Dollar; Sell Currency, Singapore Dollar
Derivative [Line Items]
Notional Amount		$ 231