Derivative Instruments - Notional Amounts Outstanding under Foreign Currency Contracts (Detail) (Not Designated as Hedging Instrument, Foreign Exchange Contract, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014
Derivative [Line Items]
Fair Value of Assets	$ 3	$ 0
Fair Value of Liabilities	42	58
Derivative Instrument Seven [Member]
Derivative [Line Items]
Fair Value of Assets		0
Fair Value of Liabilities		11
Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
Derivative [Line Items]
Fair Value of Assets	0	0
Fair Value of Liabilities	1	5
Derivative Instrument Thirteen [Member]
Derivative [Line Items]
Fair Value of Assets		0
Fair Value of Liabilities		16
Buy Currency, British Pound; Sell Currency, Euro
Derivative [Line Items]
Fair Value of Assets	0
Fair Value of Liabilities	6
Derivative Instrument Sixteen [Member]
Derivative [Line Items]
Fair Value of Assets	0
Fair Value of Liabilities	31
Buy Currency, U.S. Dollar; Sell Currency, Taiwan Dollar
Derivative [Line Items]
Fair Value of Assets	0
Fair Value of Liabilities	1
Derivative Instrument Seventeen [Member]
Derivative [Line Items]
Fair Value of Assets	0
Fair Value of Liabilities	1
Buy Currency, Korean Won; Sell Currency, US Dollar
Derivative [Line Items]
Fair Value of Assets	3	0
Fair Value of Liabilities	0	5
Buy Currency, Euro; Sell Currency U.S. Dollar
Derivative [Line Items]
Fair Value of Assets		0
Fair Value of Liabilities		15
Derivative Instrument Eighteen [Member]
Derivative [Line Items]
Fair Value of Assets	0
Fair Value of Liabilities	0
Buy Currency, U.S. Dollar; Sell Currency, Israeli Shekel
Derivative [Line Items]
Fair Value of Assets	0	0
Fair Value of Liabilities	2	1
Buy Currency, U.S. Dollar; Sell Currency, Singapore Dollar
Derivative [Line Items]
Fair Value of Assets		0
Fair Value of Liabilities		5
Long | Derivative Instrument Seven [Member]
Derivative [Line Items]
Notional Amount		1,736
Long | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
Derivative [Line Items]
Notional Amount	1,327	656
Long | Derivative Instrument Thirteen [Member]
Derivative [Line Items]
Notional Amount		1,395
Long | Buy Currency, British Pound; Sell Currency, Euro
Derivative [Line Items]
Notional Amount	1,700
Long | Derivative Instrument Sixteen [Member]
Derivative [Line Items]
Notional Amount	1,581
Long | Buy Currency, U.S. Dollar; Sell Currency, Taiwan Dollar
Derivative [Line Items]
Notional Amount	502
Long | Derivative Instrument Seventeen [Member]
Derivative [Line Items]
Notional Amount	622
Long | Buy Currency, Korean Won; Sell Currency, US Dollar
Derivative [Line Items]
Notional Amount	590,000	731
Long | Buy Currency, Euro; Sell Currency U.S. Dollar
Derivative [Line Items]
Notional Amount		3,513
Long | Derivative Instrument Eighteen [Member]
Derivative [Line Items]
Notional Amount	199
Long | Buy Currency, U.S. Dollar; Sell Currency, Israeli Shekel
Derivative [Line Items]
Notional Amount	762	76
Long | Buy Currency, U.S. Dollar; Sell Currency, Singapore Dollar
Derivative [Line Items]
Notional Amount		650
Short | Derivative Instrument Seven [Member]
Derivative [Line Items]
Notional Amount		190,000
Short | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
Derivative [Line Items]
Notional Amount	160,000	20,000
Short | Derivative Instrument Thirteen [Member]
Derivative [Line Items]
Notional Amount		1,100
Short | Buy Currency, British Pound; Sell Currency, Euro
Derivative [Line Items]
Notional Amount	1,326
Short | Derivative Instrument Sixteen [Member]
Derivative [Line Items]
Notional Amount	1,300
Short | Buy Currency, U.S. Dollar; Sell Currency, Taiwan Dollar
Derivative [Line Items]
Notional Amount	16,000
Short | Derivative Instrument Seventeen [Member]
Derivative [Line Items]
Notional Amount	400
Short | Buy Currency, Korean Won; Sell Currency, US Dollar
Derivative [Line Items]
Notional Amount	534	2,700
Short | Buy Currency, Euro; Sell Currency U.S. Dollar
Derivative [Line Items]
Notional Amount		4,500
Short | Derivative Instrument Eighteen [Member]
Derivative [Line Items]
Notional Amount	24,000
Short | Buy Currency, U.S. Dollar; Sell Currency, Israeli Shekel
Derivative [Line Items]
Notional Amount	3,000	80,000
Short | Buy Currency, U.S. Dollar; Sell Currency, Singapore Dollar
Derivative [Line Items]
Notional Amount		$ 400