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Goodwill (Detail) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Goodwill
Balance at the beginning of the period	$ 211,711,000	$ 185,771,000
New acquisitions		27,009,000
Translation adjustments	(2,055,000)	(1,069,000)
Balance at the end of the period	209,656,000	211,711,000
Accumulated goodwill impairment losses as a result of ceasing operations of the Company's business in the United Kingdom	$ 13,400,000

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 20

-Section 45

-Paragraph 1

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X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Section 50

-Paragraph 1

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X

- Definition

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

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-Paragraph 1

-Subparagraph (a,h)

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- Definition

Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-SubTopic 20

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