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Employee Benefit Plan (Tables) | 9 Months Ended
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Jun. 30, 2013
Net Periodic Benefit Cost |
|  | Three Months Ended June 30, |  |  | Nine Months Ended June 30, |
(in thousands) |  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Components of net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 620 |  |  |  | 714 |  |  |  | 1,860 |  |  |  | 2,142 |
Expected return on plan assets |  |  | (948 | ) |  |  | (941 | ) |  |  | (2,844 | ) |  |  | (2,823 | )
Net amortization |  |  | 664 |  |  |  | 688 |  |  |  | 1,992 |  |  |  | 2,064 |
Net periodic benefit cost |  | $ | 336 |  |  | $ | 461 |  |  | $ | 1,008 |  |  | $ | 1,383 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration