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Derivatives (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2014
Swap Agreement Three [Member] |  |
Swaps: |  |
Original variable, rate debt amount | $ 300.0 |
Agreement date | Aug. 16, 2006 |
Effective date | Aug. 18, 2006 |
Expiration date | Aug. 10, 2018 |
Designed cash flow hedge date | Aug. 04, 2006 |
Swap Agreement Seven [Member] |  |
Swaps: |  |
Original variable, rate debt amount | 19.3 | [1]
Agreement date | Apr. 08, 2008 |
Effective date | Aug. 15, 2008 |
Expiration date | Jun. 15, 2015 |
Designed cash flow hedge date | Mar. 31, 2008 |
Swap Agreement Eight [Member] |  |
Swaps: |  |
Original variable, rate debt amount | 19.0 |
Agreement date | Aug. 27, 2008 |
Effective date | Aug. 29, 2008 |
Expiration date | Jul. 10, 2015 |
Designed cash flow hedge date | Apr. 10, 2008 |
Swap Agreement Nine [Member] |  |
Swaps: |  |
Original variable, rate debt amount | 30.0 |
Agreement date | Sep. 24, 2008 |
Effective date | Sep. 30, 2008 |
Expiration date | Sep. 10, 2015 |
Designed cash flow hedge date | Sep. 24, 2008 |
Swap Agreement Ten [Member] |  |
Swaps: |  |
Original variable, rate debt amount | 15.0 | [1]
Agreement date | Mar. 24, 2009 |
Effective date | Mar. 30, 2009 |
Expiration date | Mar. 30, 2016 |
Designed cash flow hedge date | Mar. 25, 2009 |
Swap Agreement Eleven [Member] |  |
Swaps: |  |
Original variable, rate debt amount | 14.7 | [1]
Agreement date | Jul. 06, 2010 |
Effective date | Aug. 15, 2010 |
Expiration date | Jul. 15, 2017 |
Designed cash flow hedge date | Jul. 06, 2010 |
Swap Agreement Twelve [Member] |  |
Swaps: |  |
Original variable, rate debt amount | 25.0 | [1]
Agreement date | Apr. 26, 2011 |
Effective date | Jun. 01, 2011 |
Expiration date | Jun. 01, 2018 |
Designed cash flow hedge date | Jun. 01, 2011 |
Swap Agreement Thirteen [Member] |  |
Swaps: |  |
Original variable, rate debt amount | 50.0 | [1]
Agreement date | Jul. 29, 2011 |
Effective date | Aug. 15, 2011 |
Expiration date | Aug. 15, 2018 |
Designed cash flow hedge date | Jul. 29, 2011 |
Swap Agreement Fourteen [Member] |  |
Swaps: |  |
Original variable, rate debt amount | 20.0 | [1]
Agreement date | Aug. 03, 2011 |
Effective date | Sep. 12, 2011 |
Expiration date | Sep. 10, 2018 |
Designed cash flow hedge date | Aug. 03, 2011 |
Swap Agreement Fifteen [Member] |  |
Swaps: |  |
Original variable, rate debt amount | 15.1 | [2]
Agreement date | Mar. 27, 2012 |
Effective date | Mar. 28, 2012 |
Expiration date | Mar. 28, 2019 |
Designed cash flow hedge date | Mar. 26, 2012 |
Swap Agreement Sixteen [Member] |  |
Swaps: |  |
Original variable, rate debt amount | 25.0 |
Agreement date | Apr. 13, 2012 |
Effective date | Apr. 16, 2012 |
Expiration date | Apr. 01, 2019 |
Designed cash flow hedge date | Apr. 12, 2012 |
Swap Agreement Seventeen [Member] |  |
Swaps: |  |
Original variable, rate debt amount | $ 44.3 |
Agreement date | Jan. 11, 2013 |
Effective date | Jan. 15, 2013 |
Expiration date | Dec. 15, 2019 |
Designed cash flow hedge date | Jan. 11, 2013 |
[1] | forward swap
[2] | operating lease

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- Definition Date the derivative is designated as a cash flow hedge. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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