Description of Operations	12 Months Ended
Mar. 31, 2019
Nature of Operations [Abstract]
Description of Operations	Description of Operations Sprint Corporation, including its consolidated subsidiaries, is a communications company offering a comprehensive range of wireless and wireline communications products and services that are designed to meet the needs of individual consumers, businesses, government subscribers and resellers. The Wireless segment includes retail, wholesale, and affiliate service revenue from a wide array of wireless voice and data transmission services and equipment sales or rentals from the sale or lease of wireless devices and the sale of accessories in the U.S., Puerto Rico and the U.S. Virgin Islands. The Wireline segment includes revenue from domestic and international wireline data communication services in addition to data and all-internet protocol (IP) communication services provided to our Wireless segment. On July 10, 2013, SoftBank Corp., which subsequently changed its name to SoftBank Group Corp., and certain of its wholly-owned subsidiaries (together, SoftBank) completed the merger (SoftBank Merger) with Sprint Nextel as contemplated by the Agreement and Plan of Merger, dated as of October 15, 2012 (as amended, the Merger Agreement) and the Bond Purchase Agreement, dated as of October 15, 2012. As a result of the SoftBank Merger, Starburst II, Inc. (Starburst II) became the parent company of Sprint Nextel. Immediately thereafter, Starburst II changed its name to Sprint Corporation and Sprint Nextel changed its name to Sprint Communications, Inc. (Sprint Communications). As a result of the completion of the SoftBank Merger in which SoftBank acquired an approximate 78% interest in Sprint Corporation and subsequent open market stock purchases, SoftBank owned nearly 85% of the outstanding common stock of Sprint Corporation as of March 31, 2019. On April 29, 2018, we announced that we entered into a Business Combination Agreement with T-Mobile US, Inc. (T-Mobile) to merge in an all-stock transaction for a fixed exchange ratio of 0.10256 of T-Mobile shares for each Sprint share, or the equivalent of 9.75 Sprint shares for each T-Mobile share (Merger Transactions). Immediately following the Merger Transactions, Deutsche Telekom AG and SoftBank Group Corp. are expected to hold approximately 42% and 27% of fully-diluted shares of the combined company, respectively, with the remaining 31% of the fully-diluted shares of the combined company held by public stockholders. The board of directors will consist of 14 directors, of which nine will be nominated by Deutsche Telekom AG, four will be nominated by SoftBank Group Corp., and the final director will be the CEO of the combined company. The combined company will be named T-Mobile, and as a result of the Merger Transactions, is expected to be able to rapidly launch a nationwide 5G network, accelerate innovation and increase competition in the U.S. wireless, video and broadband industries. The Merger Transactions are subject to customary closing conditions, including certain state and federal regulatory approvals, and regulatory approval from the Federal Communications Commission (FCC) and the Department of Justice (DOJ) is expected in the first half of calendar year 2019. Sprint and T-Mobile completed the Hart-Scott-Rodino filing with the DOJ on May 24, 2018. On June 18, 2018, the parties filed with the FCC the merger applications, including the Public Interest Statement. On July 18, 2018, the FCC accepted the applications for filing and established a public comment period for the Merger Transaction. The formal comment period concluded on October 31, 2018. The Merger Transactions received clearance from the Committee on Foreign Investment in the United States on December 17, 2018 and are awaiting further regulatory approvals. On April 27, 2019, the parties to the Business Combination Agreement extended the Outside Date (as defined in the Business Combination Agreement) to July 29, 2019.

Description of Operations

Sprint Corporation, including its consolidated subsidiaries, is a communications company offering a comprehensive range of wireless and wireline communications products and services that are designed to meet the needs of individual consumers, businesses, government subscribers and resellers.

The Wireless segment includes retail, wholesale, and affiliate service revenue from a wide array of wireless voice and data transmission services and equipment sales or rentals from the sale or lease of wireless devices and the sale of accessories in the U.S., Puerto Rico and the U.S. Virgin Islands. The Wireline segment includes revenue from domestic and international wireline data communication services in addition to data and all-internet protocol (IP) communication services provided to our Wireless segment.

On July 10, 2013, SoftBank Corp., which subsequently changed its name to SoftBank Group Corp., and certain of its wholly-owned subsidiaries (together, SoftBank) completed the merger (SoftBank Merger) with Sprint Nextel as contemplated by the Agreement and Plan of Merger, dated as of October 15, 2012 (as amended, the Merger Agreement) and the Bond Purchase Agreement, dated as of October 15, 2012. As a result of the SoftBank Merger, Starburst II, Inc. (Starburst II) became the parent company of Sprint Nextel. Immediately thereafter, Starburst II changed its name to Sprint Corporation and Sprint Nextel changed its name to Sprint Communications, Inc. (Sprint Communications). As a result of the completion of the SoftBank Merger in which SoftBank acquired an approximate 78% interest in Sprint Corporation and subsequent open market stock purchases, SoftBank owned nearly 85% of the outstanding common stock of Sprint Corporation as of March 31, 2019.

On April 29, 2018, we announced that we entered into a Business Combination Agreement with T-Mobile US, Inc. (T-Mobile) to merge in an all-stock transaction for a fixed exchange ratio of 0.10256 of T-Mobile shares for each Sprint share, or the equivalent of 9.75 Sprint shares for each T-Mobile share (Merger Transactions). Immediately following the Merger Transactions, Deutsche Telekom AG and SoftBank Group Corp. are expected to hold approximately 42% and 27% of fully-diluted shares of the combined company, respectively, with the remaining 31% of the fully-diluted shares of the combined company held by public stockholders. The board of directors will consist of 14 directors, of which nine will be nominated by Deutsche Telekom AG, four will be nominated by SoftBank Group Corp., and the final director will be the CEO of the combined company. The combined company will be named T-Mobile, and as a result of the Merger Transactions, is expected to be able to rapidly launch a nationwide 5G network, accelerate innovation and increase competition in the U.S. wireless, video and broadband industries. The Merger Transactions are subject to customary closing conditions, including certain state and federal regulatory approvals, and regulatory approval from the Federal Communications Commission (FCC) and the Department of Justice (DOJ) is expected in the first half of calendar year 2019. Sprint and T-Mobile completed the Hart-Scott-Rodino filing with the DOJ on May 24, 2018. On June 18, 2018, the parties filed with the FCC the merger applications, including the Public Interest Statement. On July 18, 2018, the FCC accepted the applications for filing and established a public comment period for the Merger Transaction. The formal comment period concluded on October 31, 2018. The Merger Transactions received clearance from the Committee on Foreign Investment in the United States on December 17, 2018 and are awaiting further regulatory approvals. On April 27, 2019, the parties to the Business Combination Agreement extended the Outside Date (as defined in the Business Combination Agreement) to July 29, 2019.