Commitments and Contingencies (Details) person in Thousands, $ in Thousands											1 Months Ended			3 Months Ended			171 Months Ended
	Jun. 14, 2023	Jun. 14, 2022	Apr. 20, 2022 USD ($)	Jan. 14, 2022 USD ($) item	Jul. 14, 2021	Dec. 30, 2020 USD ($)	Jul. 26, 2019 USD ($)	Jun. 07, 2018 USD ($)	Jun. 06, 2018	Aug. 18, 2015 USD ($)	Dec. 31, 2027	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2022 USD ($) item city person	Mar. 31, 2021 USD ($)	Mar. 31, 2018 USD ($) item	Mar. 31, 2022 USD ($) item	Jun. 14, 2025	Dec. 31, 2021 USD ($)
Commitment and Contingencies
Network development current and future expenditures														$ 10,000,000
Number of markets which are under construction | item														60
Number of cities to which 5G network service deployment is under construction | city														260
Number of population to whom 5G network service deployment is under construction | person														50
Payment to acquire certain wireless licenses and related assets																	$ 30,000,000
Aggregate amount to be paid to the winning bids														$ 7,328,000
Proceeds from Refund of Deposits on Auction															$ 337,490
Percentage of Population 5G Services offered	50.00%	20.00%												70.00%			70.00%	75.00%
Percentage of Population Northstar Wireless and SNR Wireless offered											75.00%
FCC authorizations				$ 36,216,456										$ 28,888,467			$ 28,888,467		$ 28,632,665
Commitments relating to AWS-3 Auction
Noncontrolling Interest in Variable Interest Entity														10,000,000			10,000,000
Capitalized interest on FCC authorizations [Member]
Commitment and Contingencies
Percentage of Population 5G Services offered																		70.00%
FCC authorizations														$ 7,000,000			7,000,000
Spectrum Purchase Agreement
Commitment and Contingencies
Purchase price							$ 3,590,000
Class B common stock | Northstar Manager LLC
Commitment and Contingencies
Equity Method Investment, Ownership Percentage						3.00%
Northstar Manager LLC | Class B common stock
Commitment and Contingencies
Ownership percentage						97.00%
Payment For Purchase Agreement						$ 312,000
Wireless
Commitment and Contingencies
Number of cities to which 5G network service deployment is under construction | item														260
Number of population to whom 5G network service deployment is under construction | item														50,000
Percentage of population for deploy 5G services	70.00%	20.00%										70.00%	20.00%
Payment to acquire certain wireless licenses and related assets																	20,000,000
FCC authorizations														$ 12,370,072			12,370,072
H Block Licenses
Commitment and Contingencies
FCC authorizations														1,671,506			1,671,506
DBS Licenses.
Commitment and Contingencies
FCC authorizations														677,409			677,409
700 MHz Licenses
Commitment and Contingencies
FCC authorizations														711,871			711,871
600 MHz Licenses
Commitment and Contingencies
FCC authorizations														6,212,579			6,212,579
MVDDS
Commitment and Contingencies
FCC authorizations														24,000			24,000
28 GHz Licenses
Commitment and Contingencies
FCC authorizations														2,883			2,883
24 GHz Licenses
Commitment and Contingencies
FCC authorizations														11,772			11,772
37 Ghz, 39 Ghz and 47 Ghz Licenses
Commitment and Contingencies
FCC authorizations														202,533			202,533
3550-3650 MHz Licenses
Commitment and Contingencies
FCC authorizations														912,939			912,939
Ghz 3.7 to 3.98
Commitment and Contingencies
FCC authorizations														2,580			2,580
Ghz 3.45 to 3.55
Commitment and Contingencies
Aggregate amount to be paid to the winning bids				7,328,000										7,328,000
FCC authorizations				$ 7,327,989
Number of priority access licenses | item				1,232
Northstar Licenses
Commitment and Contingencies
FCC authorizations														$ 5,618,930			5,618,930
AWS-3 Licenses
Commitment and Contingencies
Accelerated build out period														2 years
FCC authorizations														$ 9,890,389			9,890,389
AWS-4 Licenses
Commitment and Contingencies
FCC authorizations														1,940,000			1,940,000
SNR Licenses
Commitment and Contingencies
FCC authorizations														4,271,459			4,271,459
Capitalized Interest
Commitment and Contingencies
FCC authorizations														6,628,006			6,628,006
Northstar Spectrum And SNR Holdco
Commitment and Contingencies
Ownership interest														411,000			411,000		395,000
Commitments relating to AWS-3 Auction
Noncontrolling Interest in Variable Interest Entity														$ 10,000,000			$ 10,000,000
Northstar Spectrum And SNR Holdco | AWS-3 Licenses
Commitment and Contingencies
Interim Build-out Requirement (as a percent)														40.00%
Final Build-out Requirement (as a percent)														75.00%
Accelerated period to meet Final Build-Out Requirement on failure to meet Interim Build-Out Requirement														2 years
Commitments relating to AWS-3 Auction
Percentage of bidding credit														25.00%
Northstar Wireless or Northstar Spectrum
Commitment and Contingencies
Interim payment percentage														15.00%
Re-Auction payment														$ 1,892,000
Overpayment of interim payment														$ 334,000
Northstar Wireless or Northstar Spectrum | Preferred Class A
Commitment and Contingencies
Ownership percentage														100.00%
Northstar Wireless or Northstar Spectrum | Northstar Manager LLC
Commitments relating to AWS-3 Auction
Controlling interest owned by other companies														15.00%
Equity contribution																$ 133,000
Northstar Wireless or Northstar Spectrum | American II.
Commitment and Contingencies
Ownership percentage														85.00%
Loan made														$ 69,000
Commitments relating to AWS-3 Auction
Equity contribution																7,621,000
Northstar Wireless or Northstar Spectrum | AWS 3 Auction
Commitment and Contingencies
Interim Payment														$ 334,000
Interim payment percentage														15.00%
Northstar Wireless or Northstar Spectrum | Northstar Licenses
Commitment and Contingencies
Number of wireless spectrum licenses | item														261			261
Commitments relating to AWS-3 Auction
Gross winning bids														$ 5,619,000
Bidding credit value										$ 1,961,000
Northstar Wireless or Northstar Spectrum | AWS-3 Licenses
Commitment and Contingencies
Non-payment gross winning bids														2,226,000			$ 2,226,000
Commitments relating to AWS-3 Auction
Gross winning bids														$ 7,845,000
Percentage of bidding credit														25.00%
Net winning bid														$ 5,884,000
Northstar Wireless or Northstar Spectrum | SNR Licenses
Commitments relating to AWS-3 Auction
Percentage of bidding credit										25.00%
SNR Wireless or SNR Wireless Holdco
Commitment and Contingencies
Non-payment gross winning bids														$ 1,211,000			1,211,000
Interim payment percentage														15.00%
Re-Auction payment														$ 1,029,000
Overpayment of interim payment														$ 182,000
SNR Wireless or SNR Wireless Holdco | Maximum
Commitment and Contingencies
Preferred stock quarterly distribution (as a percent)								12.00%
SNR Wireless or SNR Wireless Holdco | Minimum
Commitment and Contingencies
Preferred stock quarterly distribution (as a percent)								8.00%
SNR Wireless or SNR Wireless Holdco | SNR Wireless Management LLC
Commitments relating to AWS-3 Auction
Controlling interest owned by other companies														15.00%
Equity contribution																93,000
SNR Wireless or SNR Wireless Holdco | American II.
Commitment and Contingencies
Window of days for management to put its interest								270 days
Additional days allowed for management to put its interest								90 days	90 days
Commitments relating to AWS-3 Auction
Value of ownership rights accrued														$ 88,000			$ 88,000
SNR Wireless or SNR Wireless Holdco | American II. | Maximum
Commitment and Contingencies
Preferred stock quarterly distribution (as a percent)								12.00%
Window of days for management to put its interest								90 days
SNR Wireless or SNR Wireless Holdco | American II. | Minimum
Commitment and Contingencies
Preferred stock quarterly distribution (as a percent)								8.00%
Window of days for management to put its interest									30 days
SNR Wireless or SNR Wireless Holdco | American III
Commitment and Contingencies
Number of wireless spectrum licenses | item														244			244
Loan made														$ 344,000
Debt outstanding amount																5,065,000
Principal amount of debt																500,000
Window of days for management to put its interest								90 days	30 days
Additional days allowed for management to put its interest								90 days
Additional loan to pay gross winning bids														344,000
Commitments relating to AWS-3 Auction
Equity contribution																$ 5,590,000
Gross winning bids														4,271,000
Value of ownership rights accrued														$ 323,000			$ 323,000
SNR Wireless or SNR Wireless Holdco | American III | Preferred Class A
Commitment and Contingencies
Number shares issued in conversion | item																5,065,415
Preferred stock quarterly distribution (as a percent)																12.00%
SNR Wireless or SNR Wireless Holdco | American III | Maximum
Commitment and Contingencies
Interest rate (as a percent)																12.00%
SNR Wireless or SNR Wireless Holdco | American III | Minimum
Commitment and Contingencies
Interest rate (as a percent)														6.00%			6.00%
SNR Wireless or SNR Wireless Holdco | AWS 3 Auction
Commitments relating to AWS-3 Auction
Gross winning bids														$ 5,482,000
SNR Wireless or SNR Wireless Holdco | AWS-3 Licenses
Commitment and Contingencies
Non-payment gross winning bids														1,211,000			$ 1,211,000
SNR Wireless or SNR Wireless Holdco | SNR Licenses
Commitment and Contingencies
Interim Payment														182,000
Non-payment gross winning bids														$ 1,211,000			1,211,000
Interim payment percentage														15.00%
Additional Bid Withdrawal Payment														$ 3,000
Commitments relating to AWS-3 Auction
Percentage of bidding credit														25.00%
Net winning bid														$ 4,112,000
Bid withdrawal payment														$ 8,000
Bidding credit value										$ 1,370,000
SNR Wireless or SNR Wireless Holdco Class B Interests [Member] | American III
Commitment and Contingencies
Ownership percentage														85.00%
SNR Wireless or SNR Wireless Holdco Class A Interests [Member] | American III
Commitment and Contingencies
Ownership percentage														100.00%
American II. | Northstar Manager LLC | Class B common stock
Commitment and Contingencies
Ownership percentage						80.00%
Prior Arrangement | Northstar Licenses
Commitment and Contingencies
Non-payment gross winning bids														$ 2,226,000			2,226,000
Prior Arrangement | Northstar Wireless or Northstar Spectrum
Commitment and Contingencies
Non-payment gross winning bids														$ 2,226,000			2,226,000
Commitments relating to AWS-3 Auction
Number of licenses returned | item														84
Prior Arrangement | SNR Wireless or SNR Wireless Holdco | SNR Licenses
Commitments relating to AWS-3 Auction
Number of licenses returned | item														113
Northstar Operative Agreement | Northstar Spectrum And SNR Holdco | American II.
Commitment and Contingencies
Debt outstanding amount																$ 6,870,000
Northstar Operative Agreement | Northstar Wireless or Northstar Spectrum | American II.
Commitment and Contingencies
Principal amount of debt																$ 500,000
Removal of consent for unsecured financing and equipment financing								$ 25,000
Northstar Operative Agreement | Northstar Wireless or Northstar Spectrum | American II. | Preferred Class A
Commitment and Contingencies
Number shares issued in conversion | item																6,870,493
Preferred stock quarterly distribution (as a percent)																12.00%
Northstar Operative Agreement | Northstar Wireless or Northstar Spectrum | American II. | Maximum
Commitment and Contingencies
Interest rate (as a percent)																12.00%
Loan balance maturity period								10 years
Northstar Operative Agreement | Northstar Wireless or Northstar Spectrum | American II. | Minimum
Commitment and Contingencies
Interest rate (as a percent)																6.00%
Loan balance maturity period									7 years
SNR Operative Agreement | SNR Wireless or SNR Wireless Holdco | American III
Commitment and Contingencies
Loan balance maturity period								10 years	7 years
Removal of consent for unsecured financing and equipment financing								$ 25,000
Network Services Agreement | DISH Network L.L.C.
Commitment and Contingencies
Agreement Term					10 years
5G network deployment obligations
Commitment and Contingencies
Total														$ 1,650,000			1,650,000
Contractual Obligation														1,650,000			1,650,000
Interest expense on finance lease obligations
Commitment and Contingencies
Total														841,000			841,000
Contractual Obligation														841,000			841,000
Satellite-related obligations
Commitment and Contingencies
2022 (remaining nine months)														2,498,190			2,498,190
2023														1,025,629			1,025,629
2024														1,110,322			1,110,322
2025														1,185,113			1,185,113
2026														1,179,142			1,179,142
Thereafter														4,846,074			4,846,074
Total														11,844,470			11,844,470		12,685,000
Decrease in contractual obligations														635,000
Contractual Obligation														$ 11,844,470			$ 11,844,470		$ 12,685,000
SNR Credit Agreement | SNR Wireless or SNR Wireless Holdco
Commitment and Contingencies
Loan made																$ 500,000
SNR Credit Agreement | SNR Wireless or SNR Wireless Holdco | American III
Commitment and Contingencies
Loan made																500,000
Northstar Credit Agreement | Northstar Wireless or Northstar Spectrum | American II.
Commitment and Contingencies
Loan made																500,000
Principal amount of debt																$ 500,000
Subsequent event | 5G network deployment obligations | Long term agreement for radio, software and integration services
Commitment and Contingencies
Network Development Future Expenditures			$ 1,200,000