[1] Wideman spent the 1998–99 season with the Elmira Sugar Kings of the Mid-Western Junior Hockey League (MWJHL), scoring 18 goals and 48 points in 47 games.

He broke out offensively in the 2007–08 season, scoring 13 goals and 36 points in 81 games, helping the Bruins return to the Stanley Cup playoffs.

[5] The following day, however, the play was reviewed and his third goal was officially credited to teammate Brooks Laich, with Wideman receiving the primary assist.

[5] At the conclusion of the 2011–12 season, as a pending unrestricted free agent, Wideman's rights were traded to the Calgary Flames on June 27, 2012, in exchange for Jordan Henry and a fifth-round draft pick.

[citation needed] Wideman started off slowly in 2014-15, and was made a healthy scratch by coach Bob Hartley in just the second game of the year; however, he quickly heated up and recorded a phenomenal season, setting career highs in goals, assists, and points.

[citation needed] Expected to continue his torrid pace into the 2015-16 season, Wideman instead struggled through the opening months of the year.

Wideman failed to record a point in his last ten games of a disappointing, hectic year in which the Flames missed the playoffs.

Wideman struggled through the season, only posting five goals and 18 points through 57 games, before being benched for much of the latter part of the year after the Flames acquired Michael Stone from Arizona.

[citation needed] On January 27, 2016, Wideman struck linesman Don Henderson from behind in a game between the Flames and Nashville Predators.

[9] It was later revealed that Wideman had also suffered a concussion on the Salomaki body check and refused treatment by the Flames' training staff, in violation of the NHL's mandatory head injury protocols.

[11] On February 3, he was handed a 20-game suspension without pay for the incident, the minimum sanction for deliberately striking an on-ice official under NHL Rule 40.2.

[13] The suspension was immediately appealed to NHL Commissioner Gary Bettman, who upheld the initial ruling, saying that a lengthy ban was merited given "the severity of the conduct involved."

The National Hockey League Players' Association then appealed Wideman's suspension to a neutral arbitrator—the first time that this procedure had been used since the adoption of the renewed collective bargaining agreement.

On March 11, arbitrator James Oldham concluded Wideman's attack on Henderson was not intentional and that he should have been penalized under Rule 40.3, thus reducing the penalty to 10 games.

[14][15][16] On April 20, 2017 the CBC reported that Henderson was suing both Wideman and the Calgary Flames for CAD $10.25 million as a result of the injuries sustained from the hit.

[17] On March 2, 2018, the Court of Queen's Bench in Calgary dismissed the lawsuit, reasoning that the dispute should be settled through the NHL's arbitration process.

On November 23, 2017, he concluded his professional playing career after 13 years by accepting an assistant coaching role with the major junior team Kitchener Rangers of the OHL.