There have been four accruals. The first accrual is organized into four series: correspondence, 1968-1981; editorial files, 1981-1983; Art Department photographs, 1927-[1983?]; Scrapbooks, 1960-1976. Authors in the correspondence series include: Lovat Dickson, Hugh Garner, John Glassco, Norman Levine, George Woodcock, Margaret Atwood, Pierre Berton, Matt Cohen, John Robert Colombo, Marian Engel, Mavis Gallant, Margaret Laurence, Brian Moore, Peter C. Newman, Mordecai Richler, Michael Bliss, Kenneth McNaught, George Bowering, Louis Dudek, George Faludy, Ralph Gustafson, Irving Layton, Dennis Lee, Dorothy Livesay, Susan Musgrave, Michael Ondaatje, Miriam Waddington and Tom Wayman. This accrual reflects, to a very marked degree, the tenure of Robert Fulford.
The second accrual (13-2002) is organized into 6 series : Writers Files kept by editor Paul Wilson; Letters to the editor (Christina Brandao, John Fraser, Lisa Rundle, Robert Weaver and Kenneth Whyte); Production; Awards and photographs; News clippings and Card index. This accrual was received with a book collection and issues of Saturday Night from the 1930s and 1940s with a few earlier issues. The book collection and journals are listed separately and will be catalogued for Research Collections independently of this accrual. The third accrual (02-2003) is organized into 3 series: Editorial correspondence; Writers Files and Awards and Letters to the Editor. When the magazine suspended publication in 2005, all files at St. Joseph Media offices were removed; they did not come to McMaster. The fourth accrual (27-2007) consists of printed materials re the history of Saturday Night compiled by George Fetherling.