Acquisition of Magellan - Schedule of Preliminary Amounts of Identifiable Assets Acquired and Liabilities Assumed in Acquisition (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 24, 2016	Sep. 30, 2015
Fair value of assets acquired -
Goodwill	$ 63,698		$ 22,349
Magellan [Member]
Fair value of assets acquired -
Cash and equivalents		$ 3,400
Accounts receivable		1,700
Inventories		1,400
Other current assets		340
Property, plant and equipment		2,590
Goodwill		42,740
Other intangible assets:
Fair value of assets acquired net		79,780
Fair value of liabilities assumed -
Accounts payable and accrued expenses		1,590
Deferred income tax liabilities		10,500
Total consideration		67,690
Magellan [Member] | As Initially Reported [Member]
Fair value of assets acquired -
Cash and equivalents		3,420
Accounts receivable		1,700
Inventories		1,400
Other current assets		330
Property, plant and equipment		2,790
Goodwill		42,730
Other intangible assets:
Fair value of assets acquired net		79,980
Fair value of liabilities assumed -
Accounts payable and accrued expenses		1,610
Deferred income tax liabilities		10,570
Total consideration		67,800
Magellan [Member] | Measurement Period Adjustments [Member]
Fair value of assets acquired -
Cash and equivalents		(20)
Other current assets		10
Property, plant and equipment		(200)
Goodwill		10
Other intangible assets:
Fair value of assets acquired net		(200)
Fair value of liabilities assumed -
Accounts payable and accrued expenses		(20)
Deferred income tax liabilities		(70)
Total consideration		(110)
Magellan [Member] | Customer Relationships [Member]
Other intangible assets:
Other intangible assets		12,630
Magellan [Member] | Customer Relationships [Member] | As Initially Reported [Member]
Other intangible assets:
Other intangible assets		12,630
Magellan [Member] | Technology [Member]
Other intangible assets:
Other intangible assets		10,550
Magellan [Member] | Technology [Member] | As Initially Reported [Member]
Other intangible assets:
Other intangible assets		10,550
Magellan [Member] | Non-Compete Agreements [Member]
Other intangible assets:
Other intangible assets		740
Magellan [Member] | Non-Compete Agreements [Member] | As Initially Reported [Member]
Other intangible assets:
Other intangible assets		740
Magellan [Member] | Trade Names [Member]
Other intangible assets:
Other intangible assets		3,690
Magellan [Member] | Trade Names [Member] | As Initially Reported [Member]
Other intangible assets:
Other intangible assets		$ 3,690