National Storage Affiliates Trust Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

DEBT FINANCING - Credit Facility Amendment (Details)

DEBT FINANCING - Credit Facility Amendment (Details) - USD ($)		3 Months Ended
	Jul. 29, 2019	Sep. 30, 2019	Apr. 24, 2019
Debt Instrument [Line Items]
Effective interest rate (percent)			4.27%
Credit Facility
Debt Instrument [Line Items]
Extension fee (percent)	0.075%
Unsecured Debt \| Credit Facility
Debt Instrument [Line Items]
Amended credit facility total borrowing capacity increase	$ 255,000,000.0
Maximum borrowing capacity	1,275,000,000
Maximum borrowing capacity if expansion option is exercised	$ 1,750,000,000
Maximum total leverage ratio		60.00%
Maximum total leverage ratio allowable within two quarters of material acquisition		65.00%
Minimum fixed charge ratio		1.5
Maximum unsecured debt to unencumbered asset value ratio		60.00%
Maximum unsecured debt to unencumbered asset value ratio allowable within two quarters of material acquisition		65.00%
Minimum encumbered adjusted net operating income to unsecured interest expense ratio		2.0
Unsecured Debt \| Credit Facility \| Fed Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	0.50%
Unsecured Debt \| Credit Facility \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.00%
Unsecured Debt \| Credit Facility \| LIBOR \| Minimum
Debt Instrument [Line Items]
Leverage based applicable margin (percent)	1.15%
Credit pricing elective applicable margin (percent)	0.78%
Unsecured Debt \| Credit Facility \| LIBOR \| Maximum
Debt Instrument [Line Items]
Leverage based applicable margin (percent)	2.20%
Credit pricing elective applicable margin (percent)	2.25%
Unsecured Debt \| Credit Facility \| Base Rate \| Minimum
Debt Instrument [Line Items]
Leverage based applicable margin (percent)	0.15%
Credit pricing elective applicable margin (percent)	0.00%
Unsecured Debt \| Credit Facility \| Base Rate \| Maximum
Debt Instrument [Line Items]
Leverage based applicable margin (percent)	1.20%
Credit pricing elective applicable margin (percent)	1.25%
Revolving line of credit \| Credit Facility \| Minimum
Debt Instrument [Line Items]
Usage based fees with respect to unused portion of Revolver (percent)	0.15%
Ratings based fees if credit pricing elected (percent)	0.125%
Revolving line of credit \| Credit Facility \| Maximum
Debt Instrument [Line Items]
Usage based fees with respect to unused portion of Revolver (percent)	0.20%
Ratings based fees if credit pricing elected (percent)	0.30%
Revolving line of credit \| Line of Credit \| Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 500,000,000.0
Effective interest rate (percent)		3.32%
Revolving line of credit remaining borrowing capacity		$ 494,300,000
Term loan A \| Unsecured Debt \| Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	125,000,000.0
Effective interest rate (percent)		3.74%
Term loan B \| Unsecured Debt \| Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	250,000,000.0
Effective interest rate (percent)		2.91%
Term loan C \| Unsecured Debt \| Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	225,000,000.0
Effective interest rate (percent)		2.80%
Term loan D \| Unsecured Debt \| Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 175,000,000.0
Effective interest rate (percent)		3.57%
Letter of credit \| Line of Credit \| Credit Facility
Debt Instrument [Line Items]
Letters of credit outstanding		$ 5,700,000