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Fair value measurements - Additional Information (Details) $ in Thousands |  | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 28, 2014 | Jun. 30, 2015 USD ($) | Jun. 30, 2013 USD ($) | Sep. 30, 2013 | Oct. 01, 2015 USD ($) | Mar. 31, 2015 USD ($)
Derivative |  |  |  |  |  |
Amount expected to be reclassified into earnings |  | $ (1,061) |  |  |  |
Trading Symbol |  | SBLK |  |  |  |
Interest Rate Swap A - fix forward floating interest rate for first tranche of Credit Agricole $70,000 Facility |  |  |  |  |  |
Derivative |  |  |  |  |  |
Maturity date |  |  | Aug. 09, 2018 |  |  |
Derivative Asset Notional Amount |  | $ 25,869 | $ 26,840 |  |  |
Fixed rate, per annum |  |  | 1.705% |  |  |
Interest Rate Swap B - fix forward floating interest rate for second tranche of Credit Agricole $70,000 Facility |  |  |  |  |  |
Derivative |  |  |  |  |  |
Maturity date |  |  | Nov. 09, 2018 |  |  |
Derivative Asset Notional Amount |  | 27,129 | $ 28,628 |  |  |
Fixed rate, per annum |  |  | 1.72% |  |  |
Fix forward 50% of floating interest rate for the HSH Nordbank AG $35,000 Facility |  |  |  |  |  |
Derivative |  |  |  |  |  |
Number of interest rate derivatives held by the Company | 2 |  |  |  |  |
Maturity date | Sep. 28, 2018 |  |  |  |  |
Derivative Asset Notional Amount |  | 15,990 |  |  |  |
Fixed rate, per annum | 1.765% |  |  |  |  |
Goldman Sachs Swaps |  |  |  |  |  |
Derivative |  |  |  |  |  |
Number of interest rate derivatives held by the Company |  |  |  | 5 |  |
Maturity date |  |  |  | Apr. 01, 2018 |  |
Derivative Asset Notional Amount |  | 343,533 |  |  | $ 461,264 |
Derivative lower fixed interest rate range |  |  |  | 1.79% |  |
Derivative higher fixed interest rate range |  |  |  | 2.07% |  |
Accumulated other comprehensive loss |  |  |  |  |  | $ 3,639
Quoted Prices in Active Markets for Identical Liabilities (Level 1) |  |  |  |  |  |
Derivative |  |  |  |  |  |
8.00% 2019 Notes fair value |  | $ 44,360 |  |  |  |
8.00% 2019 Notes |  |  |  |  |  |
Derivative |  |  |  |  |  |
Trading Symbol |  | SBLKL |  |  |  |

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