Acquisitions And Dispositions (Narrative) (Details)														3 Months Ended	12 Months Ended
	Mar. 30, 2020 EUR (€)	Mar. 30, 2020 USD ($)	Nov. 30, 2019 USD ($)	Oct. 14, 2019 USD ($) shares	Sep. 02, 2019 USD ($)	Jul. 31, 2019 USD ($)	Mar. 27, 2019 EUR (€)	Mar. 27, 2019 USD ($)	Mar. 28, 2018 EUR (€)	Mar. 28, 2018 USD ($)	Dec. 04, 2017 USD ($)	Aug. 31, 2017 EUR (€)	Aug. 31, 2017 USD ($)	May 30, 2020 USD ($)	May 30, 2020 USD ($)	May 25, 2019 EUR (€)	May 25, 2019 USD ($)	May 26, 2018 USD ($) item	Sep. 02, 2019 SEK (kr)	Sep. 02, 2019 USD ($)
Business Acquisition [Line Items]
Estimated initial contingent consideration															$ 6,290,000
Acquisition of business, cash paid															32,314,000
Contingent consideration adjustment															794,000		$ (590,000)
Revenue															703,353,000		728,999,000	$ 654,129,000
Income from operations															$ 36,652,000		50,159,000	$ 30,624,000
Number of businesses acquired | item																		2
Resources Global Professionals Sweden AB [Member]
Business Acquisition [Line Items]
Disposition consideration																			kr 1,016,862	$ 105,000
Loss on sale of assets					$ 38,000
Belgium, Luxembourg And Norway [Member]
Business Acquisition [Line Items]
Costs related to employee termination benefits														$ 700,000
Expertence [Member]
Business Acquisition [Line Items]
Performance period															18 months
Estimated initial contingent consideration															$ 305,000
Acquisition of business, cash paid			$ 400,000												383,000
Veracity [Member]
Business Acquisition [Line Items]
Acquisition of business, cash paid						$ 30,300,000
Cash acquired						$ 2,100,000
Contingent consideration adjustment															1,300,000
Contingent consideration liability														7,600,000	7,600,000
Contingent consideration liability, current														5,000,000	5,000,000
Contingent consideration liability, noncurrent														$ 2,600,000	2,600,000
Revenue															18,800,000
Income from operations															4,100,000
Acquisition-related costs															600,000
Taskforce [Member]
Business Acquisition [Line Items]
Estimated initial contingent consideration															6,514,000
Acquisition of business, cash paid															$ 4,384,000
Contingent consideration adjustment																€ (523,000)	$ (590,000)
Contingent consideration paid	€ 1,600,000	$ 1,800,000					€ 1,600,000	$ 1,900,000	€ 2,100,000	$ 2,600,000		€ 5,800,000	$ 6,900,000
Taskforce [Member] | Contingent Consideration Due For Calendar Year 2017 [Member]
Business Acquisition [Line Items]
Contingent consideration, factor by which EBITDA is multiplied to calculate consideration payable														610.00%	610.00%
Contingent consideration, percentage payable to employees of the acquired business														20.00%	20.00%
Taskforce [Member] | Contingent Consideration Due For Calendar Year 2018 [Member]
Business Acquisition [Line Items]
Contingent consideration, factor by which EBITDA is multiplied to calculate consideration payable														610.00%	610.00%
Contingent consideration, percentage payable to employees of the acquired business														15.00%	15.00%
Taskforce [Member] | Contingent Consideration Due For Calendar Year 2019 [Member]
Business Acquisition [Line Items]
Contingent consideration, factor by which EBITDA is multiplied to calculate consideration payable														610.00%	610.00%
Contingent consideration, percentage payable to employees of the acquired business														15.00%	15.00%
Accretive [Member]
Business Acquisition [Line Items]
Acquisition of business, cash paid											$ 20,000,000				$ 20,047,000
Share restriction period															4 years
Shares issued | shares				82,762
Proceeds from escrow				$ 600,000
Gain from claim pre-acquisition claim settlement															$ 500,000