Shareholder Report |
6 Months Ended | |||||||||
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Jul. 31, 2025
USD ($)
shares
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| Shareholder Report [Line Items] | ||||||||||
| Document Type | N-CSRS | |||||||||
| Amendment Flag | false | |||||||||
| Registrant Name | Fidelity New York Municipal Trust II | |||||||||
| Entity Central Index Key | 0000878663 | |||||||||
| Entity Investment Company Type | N-1A | |||||||||
| Document Period End Date | Jul. 31, 2025 | |||||||||
| Fidelity New York Municipal Money Market Fund | ||||||||||
| Shareholder Report [Line Items] | ||||||||||
| Fund Name | Fidelity® New York Municipal Money Market Fund | |||||||||
| Class Name | Fidelity® New York Municipal Money Market Fund | |||||||||
| Trading Symbol | FAWXX | |||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® New York Municipal Money Market Fund for the period February 1, 2025 to July 31, 2025. | |||||||||
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||
| Additional Information Phone Number | 1-800-544-8544 | |||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||
| Expenses [Text Block] | What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
|
|||||||||
| Expenses Paid, Amount | $ 21 | |||||||||
| Expense Ratio, Percent | 0.42% | |||||||||
| Net Assets | $ 4,468,711,800 | |||||||||
| Holdings Count | shares | 423 | |||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of July 31, 2025)
|
|||||||||
| Holdings [Text Block] | EFFECTIVE MATURITY DIVERSIFICATION (% of Fund's net assets) Days 1-7 85.0 8-30 0.3 31-60 4.9 61-90 0.8 91-180 2.9 >180 5.6 Variable Rate Demand Notes (VRDNs) 50.1 Tender Option Bond 26.8 Municipal Securities 12.7 Commercial Paper 1.7 Net Other Assets (Liabilities) 8.7 ASSET ALLOCATION (% of Fund's net assets) Variable Rate Demand Notes (VRDNs) - 50.1 Tender Option Bond - 26.8 Municipal Securities - 12.7 Commercial Paper - 1.7 Net Other Assets (Liabilities) - 8.7 | |||||||||
| Fidelity New York Municipal Money Market Fund - Premium Class | ||||||||||
| Shareholder Report [Line Items] | ||||||||||
| Fund Name | Fidelity® New York Municipal Money Market Fund | |||||||||
| Class Name | Fidelity® New York Municipal Money Market Fund Premium Class | |||||||||
| Trading Symbol | FSNXX | |||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® New York Municipal Money Market Fund for the period February 1, 2025 to July 31, 2025. | |||||||||
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||
| Additional Information Phone Number | 1-800-544-8544 | |||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||
| Expenses [Text Block] | What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
|
|||||||||
| Expenses Paid, Amount | $ 15 | |||||||||
| Expense Ratio, Percent | 0.30% | |||||||||
| Net Assets | $ 4,468,711,800 | |||||||||
| Holdings Count | shares | 423 | |||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of July 31, 2025)
|
|||||||||
| Holdings [Text Block] | EFFECTIVE MATURITY DIVERSIFICATION (% of Fund's net assets) Days 1-7 85.0 8-30 0.3 31-60 4.9 61-90 0.8 91-180 2.9 >180 5.6 Variable Rate Demand Notes (VRDNs) 50.1 Tender Option Bond 26.8 Municipal Securities 12.7 Commercial Paper 1.7 Net Other Assets (Liabilities) 8.7 ASSET ALLOCATION (% of Fund's net assets) Variable Rate Demand Notes (VRDNs) - 50.1 Tender Option Bond - 26.8 Municipal Securities - 12.7 Commercial Paper - 1.7 Net Other Assets (Liabilities) - 8.7 | |||||||||
| Fidelity New York Municipal Money Market Fund - Institutional Class | ||||||||||
| Shareholder Report [Line Items] | ||||||||||
| Fund Name | Fidelity® New York Municipal Money Market Fund | |||||||||
| Class Name | Fidelity® New York Municipal Money Market Fund Institutional Class | |||||||||
| Trading Symbol | FNKXX | |||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® New York Municipal Money Market Fund for the period February 1, 2025 to July 31, 2025. | |||||||||
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. | |||||||||
| Additional Information Phone Number | 1-877-208-0098 | |||||||||
| Additional Information Email | fidfunddocuments@fidelity.com | |||||||||
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec | |||||||||
| Expenses [Text Block] | What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
|
|||||||||
| Expenses Paid, Amount | $ 10 | |||||||||
| Expense Ratio, Percent | 0.20% | |||||||||
| Net Assets | $ 4,468,711,800 | |||||||||
| Holdings Count | shares | 423 | |||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of July 31, 2025)
|
|||||||||
| Holdings [Text Block] | EFFECTIVE MATURITY DIVERSIFICATION (% of Fund's net assets) Days 1-7 85.0 8-30 0.3 31-60 4.9 61-90 0.8 91-180 2.9 >180 5.6 Variable Rate Demand Notes (VRDNs) 50.1 Tender Option Bond 26.8 Municipal Securities 12.7 Commercial Paper 1.7 Net Other Assets (Liabilities) 8.7 ASSET ALLOCATION (% of Fund's net assets) Variable Rate Demand Notes (VRDNs) - 50.1 Tender Option Bond - 26.8 Municipal Securities - 12.7 Commercial Paper - 1.7 Net Other Assets (Liabilities) - 8.7 |