Derivative Instruments - Notional Amounts Outstanding under Foreign Currency Contracts (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Buy Currency, British Pound; Sell Currency, Swedish Krona
Derivative [Line Items]
Fair Value of Assets	$ 1
Buy Currency, British Pound; Sell Currency, Euro
Derivative [Line Items]
Fair Value of Assets		$ 0
Buy Currency, Euro; Sell Currency, British Pound
Derivative [Line Items]
Fair Value of Assets	0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Fair Value of Assets	5	89
Fair Value of Liabilities	(96)	(36)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Buy Currency, British Pound; Sell Currency, Swedish Krona
Derivative [Line Items]
Fair Value of Liabilities	0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Buy Currency, U.S. Dollar; Sell Currency, Korean Won
Derivative [Line Items]
Fair Value of Assets		0
Fair Value of Liabilities		(6)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Buy Currency, British Pound; Sell Currency, Euro
Derivative [Line Items]
Fair Value of Liabilities		(29)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Buy Currency, U.S. Dollar; Sell Currency, Taiwan Dollar
Derivative [Line Items]
Fair Value of Assets		0
Fair Value of Liabilities		(1)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Buy Currency, U.S. Dollar; Sell Currency, British Pound
Derivative [Line Items]
Fair Value of Assets	2	32
Fair Value of Liabilities	0	0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Buy Currency, U.S. Dollar; Sell Currency, Chinese Yuan
Derivative [Line Items]
Fair Value of Assets	0	15
Fair Value of Liabilities	(33)	0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Buy Currency, Euro; Sell Currency, U.S. Dollar
Derivative [Line Items]
Fair Value of Assets	0	40
Fair Value of Liabilities	(40)	0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Buy Currency, Korean Won; Sell Currency, U.S. Dollar
Derivative [Line Items]
Fair Value of Assets	1
Fair Value of Liabilities	0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Buy Currency, Euro; Sell Currency, British Pound
Derivative [Line Items]
Fair Value of Liabilities	(23)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
Derivative [Line Items]
Fair Value of Assets		0
Fair Value of Liabilities		0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
Derivative [Line Items]
Fair Value of Assets		2
Fair Value of Liabilities		0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Buy Currency, U.S. Dollar; Sell Currency, Israeli Shekel
Derivative [Line Items]
Fair Value of Assets	1	0
Fair Value of Liabilities	0	0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Long [Member] | Buy Currency, British Pound; Sell Currency, Swedish Krona
Derivative [Line Items]
Notional Amount	246
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Long [Member] | Buy Currency, U.S. Dollar; Sell Currency, Korean Won
Derivative [Line Items]
Notional Amount		1,543
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Long [Member] | Buy Currency, British Pound; Sell Currency, Euro
Derivative [Line Items]
Notional Amount		2,157
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Long [Member] | Buy Currency, U.S. Dollar; Sell Currency, Taiwan Dollar
Derivative [Line Items]
Notional Amount		662
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Long [Member] | Buy Currency, U.S. Dollar; Sell Currency, British Pound
Derivative [Line Items]
Notional Amount	6,107	4,308
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Long [Member] | Buy Currency, U.S. Dollar; Sell Currency, Chinese Yuan
Derivative [Line Items]
Notional Amount	5,815	5,177
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Long [Member] | Buy Currency, Euro; Sell Currency, U.S. Dollar
Derivative [Line Items]
Notional Amount	14,976	9,300
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Long [Member] | Buy Currency, Korean Won; Sell Currency, U.S. Dollar
Derivative [Line Items]
Notional Amount	2,255
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Long [Member] | Buy Currency, Euro; Sell Currency, British Pound
Derivative [Line Items]
Notional Amount	8,403
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Long [Member] | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
Derivative [Line Items]
Notional Amount		425
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Long [Member] | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
Derivative [Line Items]
Notional Amount		1,336
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Long [Member] | Buy Currency, U.S. Dollar; Sell Currency, Israeli Shekel
Derivative [Line Items]
Notional Amount	311	457
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Short [Member] | Buy Currency, British Pound; Sell Currency, Swedish Krona
Derivative [Line Items]
Notional Amount	2,100
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Short [Member] | Buy Currency, U.S. Dollar; Sell Currency, Korean Won
Derivative [Line Items]
Notional Amount		1,852,000
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Short [Member] | Buy Currency, British Pound; Sell Currency, Euro
Derivative [Line Items]
Notional Amount		1,600
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Short [Member] | Buy Currency, U.S. Dollar; Sell Currency, Taiwan Dollar
Derivative [Line Items]
Notional Amount		22,000
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Short [Member] | Buy Currency, U.S. Dollar; Sell Currency, British Pound
Derivative [Line Items]
Notional Amount	4,710	6,520
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Short [Member] | Buy Currency, U.S. Dollar; Sell Currency, Chinese Yuan
Derivative [Line Items]
Notional Amount	39,000	33,000
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Short [Member] | Buy Currency, Euro; Sell Currency, U.S. Dollar
Derivative [Line Items]
Notional Amount	13,300	8,253
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Short [Member] | Buy Currency, Korean Won; Sell Currency, U.S. Dollar
Derivative [Line Items]
Notional Amount	2,488,000
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Short [Member] | Buy Currency, Euro; Sell Currency, British Pound
Derivative [Line Items]
Notional Amount	6,500
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Short [Member] | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
Derivative [Line Items]
Notional Amount		51,000
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Short [Member] | Buy Currency, U.S. Dollar; Sell Currency, Japanese Yen
Derivative [Line Items]
Notional Amount		160,000
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Short [Member] | Buy Currency, U.S. Dollar; Sell Currency, Israeli Shekel
Derivative [Line Items]
Notional Amount	$ 1,169	$ 1,800