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Selected Quarterly Financial Data (unaudited) - Schedule of Quarterly Financial Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 01, 2017 | Oct. 02, 2016 | Jul. 03, 2016 | Apr. 03, 2016 | Jan. 03, 2016 | [1] | Sep. 27, 2015 | Jun. 28, 2015 | Mar. 29, 2015 | Jan. 01, 2017 | Jan. 03, 2016 | Dec. 28, 2014
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from services | $ 1,304,400,000 |  | $ 1,247,800,000 |  | $ 1,375,500,000 |  | $ 1,349,100,000 |  | $ 1,461,600,000 |  | $ 1,351,000,000 |  | $ 1,385,000,000 |  | $ 1,320,600,000 |  | $ 5,276,800,000 |  | $ 5,518,200,000 | [2] | $ 5,562,700,000
Gross profit | 228,000,000 |  | 215,100,000 |  | 230,500,000 |  | 232,700,000 |  | 249,500,000 |  | 228,200,000 |  | 222,300,000 |  | 220,300,000 |  | 906,300,000 |  | 920,300,000 | [2] | 908,400,000
SG&A expenses | 208,200,000 | [3] | 196,300,000 |  | 220,600,000 |  | 218,000,000 |  | 223,000,000 |  | 211,600,000 |  | 210,800,000 |  | 208,200,000 |  | 843,100,000 |  | 853,600,000 | [2] | 886,500,000
Restructuring charges included in SG&A expenses | 0 |  | 0 |  | 3,400,000 |  | 0 |  |  |  |  |  |  |  |  |  | 3,400,000 |  | 0 |  |
Gain on investment in TS Kelly Asia Pacific | 0 |  | 87,200,000 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  | 87,200,000 |  | 0 | [2] | 0
Net earnings | $ 19,800,000 |  | $ 80,900,000 |  | $ 8,900,000 |  | $ 11,200,000 |  | $ 34,200,000 |  | $ 9,100,000 |  | $ 6,800,000 |  | $ 3,700,000 |  | $ 120,800,000 |  | $ 53,800,000 | [2] | $ 23,700,000
Basic earnings per share (in dollars per share) | $ 0.51 | [4] | $ 2.08 | [4] | $ 0.23 | [4] | $ 0.29 | [4] | $ 0.88 | [4] | $ 0.23 | [4] | $ 0.18 | [4] | $ 0.10 | [4] | $ 3.10 | [4] | $ 1.39 | [2],[4] | $ 0.61
Diluted earnings per share (in dollars per share) | 0.51 | [4] | 2.06 | [4] | 0.23 | [4] | 0.29 | [4] | 0.88 | [4] | 0.23 | [4] | 0.18 | [4] | 0.10 | [4] | 3.08 | [4] | 1.39 | [2],[4] | 0.61
Dividends per share (in dollars per share) | $ 0.075 |  | $ 0.075 |  | $ 0.075 |  | $ 0.05 |  | $ 0.05 |  | $ 0.05 |  | $ 0.05 |  | $ 0.05 |  | $ 0.275 |  | $ 0.20 | [2] | $ 0.20
Adjustment for amounts determined to be uncollectible | $ 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fiscal period duration | 98 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 364 days |  | 371 days |  | 364 days
[1] | Fourth Quarter 2015 included 14 weeks.
[2] | Fiscal year included 53 weeks.
[3] | SG&A expenses in the fourth quarter includes a $2.8 million out-of-period adjustment related to certain aged accounts receivable recorded prior to 2015 at a subsidiary in Germany. The correction did not have a material effect on any of the periods impacted.
[4] | Earnings per share amounts for each quarter are required to be computed independently and may not equal the amounts computed for the total year.

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