Shareholder Report, Line Graph (Details) - USD ($)
|
12 Months Ended |
132 Months Ended |
Aug. 31, 2025 |
Aug. 31, 2025 |
| C000023057_LG_ClassMember_11YRMember |
|
|
| Account Value [Line Items] |
|
|
| Line Graph and Table Measure Name |
|
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Specialized High Income Central Fund</span>
|
| C000023057_ClassMember_AsOf_2015Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
$ 10,000
|
|
| C000023057_ClassMember_AsOf_2016Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
10,739
|
|
| C000023057_ClassMember_AsOf_2017Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
11,532
|
|
| C000023057_ClassMember_AsOf_2018Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
11,811
|
|
| C000023057_ClassMember_AsOf_2019Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
12,842
|
|
| C000023057_ClassMember_AsOf_2020Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
13,389
|
|
| C000023057_ClassMember_AsOf_2021Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
14,254
|
|
| C000023057_ClassMember_AsOf_2022Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
12,832
|
|
| C000023057_ClassMember_AsOf_2023Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
13,546
|
|
| C000023057_ClassMember_AsOf_2024Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
15,086
|
|
| C000023057_ClassMember_AsOf_2025Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
16,244
|
|
| C000023057_LG_1_AdditionalIndexMember_11YRMember |
|
|
| Account Value [Line Items] |
|
|
| Line Graph and Table Measure Name |
|
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® BB US High Yield Constrained Index</span>
|
| C000023057_1_AdditionalIndexMember_AsOf_2015Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
10,000
|
|
| C000023057_1_AdditionalIndexMember_AsOf_2016Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
10,975
|
|
| C000023057_1_AdditionalIndexMember_AsOf_2017Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
11,753
|
|
| C000023057_1_AdditionalIndexMember_AsOf_2018Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
11,915
|
|
| C000023057_1_AdditionalIndexMember_AsOf_2019Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
13,060
|
|
| C000023057_1_AdditionalIndexMember_AsOf_2020Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
13,889
|
|
| C000023057_1_AdditionalIndexMember_AsOf_2021Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
15,011
|
|
| C000023057_1_AdditionalIndexMember_AsOf_2022Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
13,447
|
|
| C000023057_1_AdditionalIndexMember_AsOf_2023Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
14,218
|
|
| C000023057_1_AdditionalIndexMember_AsOf_2024Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
15,901
|
|
| C000023057_1_AdditionalIndexMember_AsOf_2025Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
17,006
|
|
| C000023057_LG_2_AdditionalIndexMember_11YRMember |
|
|
| Account Value [Line Items] |
|
|
| Line Graph and Table Measure Name |
|
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span>
|
| C000023057_2_AdditionalIndexMember_AsOf_2015Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
10,000
|
|
| C000023057_2_AdditionalIndexMember_AsOf_2016Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
10,650
|
|
| C000023057_2_AdditionalIndexMember_AsOf_2017Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
10,793
|
|
| C000023057_2_AdditionalIndexMember_AsOf_2018Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
10,693
|
|
| C000023057_2_AdditionalIndexMember_AsOf_2019Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
11,770
|
|
| C000023057_2_AdditionalIndexMember_AsOf_2020Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
12,525
|
|
| C000023057_2_AdditionalIndexMember_AsOf_2021Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
12,636
|
|
| C000023057_2_AdditionalIndexMember_AsOf_2022Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
11,138
|
|
| C000023057_2_AdditionalIndexMember_AsOf_2023Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
11,094
|
|
| C000023057_2_AdditionalIndexMember_AsOf_2024Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
11,973
|
|
| C000023057_2_AdditionalIndexMember_AsOf_2025Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
12,419
|
|
| C000064553_LG_ClassMember_11YRMember |
|
|
| Account Value [Line Items] |
|
|
| Line Graph and Table Measure Name |
|
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® High Income Central Fund</span>
|
| C000064553_ClassMember_AsOf_2015Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
10,000
|
|
| C000064553_ClassMember_AsOf_2016Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
10,775
|
|
| C000064553_ClassMember_AsOf_2017Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
11,810
|
|
| C000064553_ClassMember_AsOf_2018Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
12,434
|
|
| C000064553_ClassMember_AsOf_2019Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
13,253
|
|
| C000064553_ClassMember_AsOf_2020Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
13,445
|
|
| C000064553_ClassMember_AsOf_2021Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
15,457
|
|
| C000064553_ClassMember_AsOf_2022Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
14,560
|
|
| C000064553_ClassMember_AsOf_2023Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
15,561
|
|
| C000064553_ClassMember_AsOf_2024Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
17,451
|
|
| C000064553_ClassMember_AsOf_2025Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
19,351
|
|
| C000064553_LG_1_AdditionalIndexMember_11YRMember |
|
|
| Account Value [Line Items] |
|
|
| Line Graph and Table Measure Name |
|
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">ICE® BofA® US High Yield Constrained Index</span>
|
| C000064553_1_AdditionalIndexMember_AsOf_2015Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
10,000
|
|
| C000064553_1_AdditionalIndexMember_AsOf_2016Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
10,922
|
|
| C000064553_1_AdditionalIndexMember_AsOf_2017Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
11,882
|
|
| C000064553_1_AdditionalIndexMember_AsOf_2018Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
12,270
|
|
| C000064553_1_AdditionalIndexMember_AsOf_2019Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
13,077
|
|
| C000064553_1_AdditionalIndexMember_AsOf_2020Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
13,551
|
|
| C000064553_1_AdditionalIndexMember_AsOf_2021Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
14,941
|
|
| C000064553_1_AdditionalIndexMember_AsOf_2022Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
13,382
|
|
| C000064553_1_AdditionalIndexMember_AsOf_2023Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
14,322
|
|
| C000064553_1_AdditionalIndexMember_AsOf_2024Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
16,109
|
|
| C000064553_1_AdditionalIndexMember_AsOf_2025Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
17,419
|
|
| C000064553_LG_2_AdditionalIndexMember_11YRMember |
|
|
| Account Value [Line Items] |
|
|
| Line Graph and Table Measure Name |
|
<span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span>
|
| C000064553_2_AdditionalIndexMember_AsOf_2015Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
10,000
|
|
| C000064553_2_AdditionalIndexMember_AsOf_2016Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
10,650
|
|
| C000064553_2_AdditionalIndexMember_AsOf_2017Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
10,793
|
|
| C000064553_2_AdditionalIndexMember_AsOf_2018Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
10,693
|
|
| C000064553_2_AdditionalIndexMember_AsOf_2019Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
11,770
|
|
| C000064553_2_AdditionalIndexMember_AsOf_2020Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
12,525
|
|
| C000064553_2_AdditionalIndexMember_AsOf_2021Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
12,636
|
|
| C000064553_2_AdditionalIndexMember_AsOf_2022Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
11,138
|
|
| C000064553_2_AdditionalIndexMember_AsOf_2023Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
11,094
|
|
| C000064553_2_AdditionalIndexMember_AsOf_2024Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
11,973
|
|
| C000064553_2_AdditionalIndexMember_AsOf_2025Member |
|
|
| Account Value [Line Items] |
|
|
| Accumulated Value |
$ 12,419
|
|