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Debt, Interest Rate Swaps (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Sep. 30, 2015
Interest rate cash flow hedges [Abstract] |  |
Unrealized gain (loss) on fair value of interest rate swaps, before tax | $ (5,746) | $ (3,686)
Unrealized gain (loss) on fair value of interest rate swaps, after tax | (3,505) | $ (2,248)
Unrealized gain (loss) expected to be recognized over the next 12 months | $ (878) |
Interest Rate Swap 1 [Member] |  |
Derivative [Line Items] |  |
Effective Date | June 2012 |
Amount | $ 40,000 |
Fixed Interest Rate | 1.88% |
Interest Rate Spread | 1.75% |
Maturity Date | June 2022 |
Interest Rate Swap 2 [Member] |  |
Derivative [Line Items] |  |
Effective Date | August 2012 |
Amount | $ 35,000 |
Fixed Interest Rate | 1.74% |
Interest Rate Spread | 1.75% |
Maturity Date | June 2022 |
Interest Rate Swap 3 [Member] |  |
Derivative [Line Items] |  |
Effective Date | September 2012 |
Amount | $ 25,000 |
Fixed Interest Rate | 1.24% |
Interest Rate Spread | 1.75% |
Maturity Date | March 2017 |
Interest Rate Swap 4 [Member] |  |
Derivative [Line Items] |  |
Effective Date | May 2014 |
Amount | $ 25,000 |
Fixed Interest Rate | 1.35% |
Interest Rate Spread | 1.75% |
Maturity Date | May 2018 |
Interest Rate Swap 5 [Member] |  |
Derivative [Line Items] |  |
Effective Date | November 2014 |
Amount | $ 25,000 |
Fixed Interest Rate | 1.26% |
Interest Rate Spread | 1.75% |
Maturity Date | June 2018 |
Interest Rate Swap 6 [Member] |  |
Derivative [Line Items] |  |
Effective Date | March 2015 |
Amount | $ 25,000 |
Fixed Interest Rate | 1.49% |
Interest Rate Spread | 1.75% |
Maturity Date | March 2019 |
Interest Rate Swap 7 [Member] |  |
Derivative [Line Items] |  |
Effective Date | September 2015 |
Amount | $ 25,000 |
Fixed Interest Rate | 1.39% |
Interest Rate Spread | 1.75% |
Maturity Date | September 2020 |
Interest Rate Swap 8 [Member] |  |
Derivative [Line Items] |  |
Effective Date | November 2015 |
Amount | $ 25,000 |
Fixed Interest Rate | 1.32% |
Interest Rate Spread | 1.75% |
Maturity Date | November 2020 |
Interest Rate Swap 9 [Member] |  |
Derivative [Line Items] |  |
Effective Date | December 2015 |
Amount | $ 25,000 |
Fixed Interest Rate | 1.59% |
Interest Rate Spread | 1.75% |
Maturity Date | December 2020 |
Interest Rate Swap 10 [Member] |  |
Derivative [Line Items] |  |
Effective Date | February 2016 |
Amount | $ 25,000 |
Fixed Interest Rate | 0.99% |
Interest Rate Spread | 1.75% |
Maturity Date | February 2020 |
Interest Rate Swap 11 [Member] |  |
Derivative [Line Items] |  |
Effective Date | February 2016 |
Amount | $ 25,000 |
Fixed Interest Rate | 1.03% |
Interest Rate Spread | 1.75% |
Maturity Date | February 2022 |

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of after tax unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective. + References No definition available. + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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