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Intangible Assets by Major Class Subject to Amortization (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2014 | Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items] |  |
Original Cost | $ 20,523 | $ 20,523
Accumulated Amortization | 8,507 | 6,872
Net Book Value | 12,016 | 13,651
Trade name |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life (in years) | 10 years | 10 years
Original Cost | 2,000 | 2,000
Accumulated Amortization | 596 | 446
Net Book Value | 1,404 | 1,554
Non-compete agreement |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life (in years) | 5 years | 5 years
Original Cost | 1,600 | 1,600
Accumulated Amortization | 908 | 668
Net Book Value | 692 | 932
Below market lease |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life (in years) | 5 years | 5 years
Original Cost | 900 | 900
Accumulated Amortization | 640 | 505
Net Book Value | 260 | 395
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life (in years) | 10 years | 10 years
Original Cost | 13,800 | 13,800
Accumulated Amortization | 4,146 | 3,111
Net Book Value | 9,654 | 10,689
Order backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life (in years) | 1 year | 1 year
Original Cost | 2,200 | 2,200
Accumulated Amortization | 2,194 | 2,119
Net Book Value | 6 | 81
Transition services |  |
Finite-Lived Intangible Assets [Line Items] |  |
Original Cost | 23 | 23
Accumulated Amortization | 23 | 23
Net Book Value | $ 0 | $ 0
Maximum | Transition services |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life (in years) | 1 year | 1 year

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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