Acquisitions - Amounts of Assets and Liabilities at Fair Value as of Acquisition Date (Detail) - USD ($) $ in Thousands				6 Months Ended
	Nov. 30, 2015	Aug. 14, 2015	Oct. 01, 2014	Mar. 31, 2016	Mar. 31, 2015	Feb. 01, 2016	Sep. 30, 2015	Sep. 30, 2014
Business Acquisition [Line Items]
Goodwill				$ 202,347		$ 24,000	$ 121,408	$ 109,501
Total purchase price, net of cash acquired				125,498	$ 17,257
BioStorage Technologies, Inc.
Business Acquisition [Line Items]
Accounts receivable	$ 16,942
Prepaid and other current assets	321
Property, plant and equipment	14,345
Intangible assets	41,460
Goodwill	79,889
Other assets	53
Debt assumed	(385)
Accounts payable	(1,708)
Deferred revenue	(1,766)
Accrued liabilities	(9,423)
Long-term deferred tax liabilities	(14,169)
Other liabilities	(61)
Total purchase price, net of cash acquired	125,498
Total purchase price, net of cash acquired	$ 128,000
BioStorage Technologies, Inc. | Trademarks
Business Acquisition [Line Items]
Finite-lived intangibles				4,900
BioStorage Technologies, Inc. | Customer Relationships
Business Acquisition [Line Items]
Finite-lived intangibles				$ 36,600
Contact Co., Ltd
Business Acquisition [Line Items]
Accounts receivable		$ 42
Inventory		2,020
Prepaid and other current assets		484
Property, plant and equipment		79
Goodwill		4,195
Other assets		1,410
Debt assumed		(8,800)
Accounts payable		(1,089)
Accrued liabilities		(1,823)
Long-term deferred tax liabilities		(774)
Total purchase price, net of cash acquired		6,834
Contact Co., Ltd | Completed Technology
Business Acquisition [Line Items]
Finite-lived intangibles		$ 2,290
FluidX
Business Acquisition [Line Items]
Accounts receivable			$ 1,980
Inventory			2,857
Prepaid and other current assets			213
Property, plant and equipment			101
Goodwill			8,247
Accounts payable			(2,079)
Deferred revenue			(72)
Accrued liabilities			(992)
Long-term deferred tax liabilities			(1,540)
Total purchase price, net of cash acquired			15,505
FluidX | Completed Technology
Business Acquisition [Line Items]
Finite-lived intangibles			1,230
FluidX | Trademarks
Business Acquisition [Line Items]
Finite-lived intangibles			750
FluidX | Customer Relationships
Business Acquisition [Line Items]
Finite-lived intangibles			$ 4,810