Shareholder Report |
6 Months Ended | |||||||||
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Jul. 31, 2026
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, 2026 | |||||||||
| 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, 2026 to July 31, 2026. | |||||||||
| 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 | $ 5,130,564,185 | |||||||||
| Holdings Count | shares | 457 | |||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of July 31, 2026)
|
|||||||||
| Holdings [Text Block] | EFFECTIVE MATURITY DIVERSIFICATION (% of Fund's net assets) Days 1-7 82.6 8-30 0.7 31-60 4.8 61-90 0.7 91-180 1.5 >180 8.5 Variable Rate Demand Notes (VRDNs) 46.8 Tender Option Bond 33.2 Municipal Securities 13.4 Commercial Paper 1.9 Net Other Assets (Liabilities) 4.7 ASSET ALLOCATION (% of Fund's net assets) Variable Rate Demand Notes (VRDNs) - 46.8 Tender Option Bond - 33.2 Municipal Securities - 13.4 Commercial Paper - 1.9 Net Other Assets (Liabilities) - 4.7 | |||||||||
| 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, 2026 to July 31, 2026. | |||||||||
| 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 | $ 5,130,564,185 | |||||||||
| Holdings Count | shares | 457 | |||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of July 31, 2026)
|
|||||||||
| Holdings [Text Block] | EFFECTIVE MATURITY DIVERSIFICATION (% of Fund's net assets) Days 1-7 82.6 8-30 0.7 31-60 4.8 61-90 0.7 91-180 1.5 >180 8.5 Variable Rate Demand Notes (VRDNs) 46.8 Tender Option Bond 33.2 Municipal Securities 13.4 Commercial Paper 1.9 Net Other Assets (Liabilities) 4.7 ASSET ALLOCATION (% of Fund's net assets) Variable Rate Demand Notes (VRDNs) - 46.8 Tender Option Bond - 33.2 Municipal Securities - 13.4 Commercial Paper - 1.9 Net Other Assets (Liabilities) - 4.7 | |||||||||
| 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, 2026 to July 31, 2026. | |||||||||
| 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 | $ 5,130,564,185 | |||||||||
| Holdings Count | shares | 457 | |||||||||
| Additional Fund Statistics [Text Block] | Key Fund Statistics
(as of July 31, 2026)
|
|||||||||
| Holdings [Text Block] | EFFECTIVE MATURITY DIVERSIFICATION (% of Fund's net assets) Days 1-7 82.6 8-30 0.7 31-60 4.8 61-90 0.7 91-180 1.5 >180 8.5 Variable Rate Demand Notes (VRDNs) 46.8 Tender Option Bond 33.2 Municipal Securities 13.4 Commercial Paper 1.9 Net Other Assets (Liabilities) 4.7 ASSET ALLOCATION (% of Fund's net assets) Variable Rate Demand Notes (VRDNs) - 46.8 Tender Option Bond - 33.2 Municipal Securities - 13.4 Commercial Paper - 1.9 Net Other Assets (Liabilities) - 4.7 |