Restructuring Expense (Details) - USD ($)	3 Months Ended	6 Months Ended		12 Months Ended
	Nov. 30, 2019	Nov. 30, 2019	Dec. 01, 2018	Jun. 01, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring Costs		$ 6,100,000	$ 1,400,000
Restructuring Reserve [Roll Forward]
Restructuring Costs		6,100,000	$ 1,400,000
International Contract
Restructuring Cost and Reserve [Line Items]
Restructuring Costs		400,000		$ 2,500,000
Restructuring and Related Cost, Cost Incurred to Date	$ 6,800,000	6,800,000
Restructuring and Related Cost, Expected Cost Remaining	0	0
Restructuring Reserve [Roll Forward]
Beginning Balance		200,000
Restructuring Costs		400,000		2,500,000
Amounts Paid		(600,000)
Ending Balance	0	0		200,000
Assets Held-for-sale, Long Lived, Fair Value Disclosure	4,300,000	4,300,000
International Contract | UNITED KINGDOM
Restructuring Reserve [Roll Forward]
Charges Against Assets				(800,000)
International Contract | CHINA
Restructuring Cost and Reserve [Line Items]
Restructuring Costs				1,400,000
Restructuring Reserve [Roll Forward]
Restructuring Costs				1,400,000
International Contract | Severance and Employee-Related
Restructuring Cost and Reserve [Line Items]
Restructuring Costs		0
Restructuring Reserve [Roll Forward]
Beginning Balance		100,000
Restructuring Costs		0
Amounts Paid		(100,000)
Ending Balance	0	0		100,000
International Contract | Exit or Disposal Activities
Restructuring Cost and Reserve [Line Items]
Effect on Future Earnings, Amount		3,000,000
Restructuring Costs	200,000	400,000
Restructuring Reserve [Roll Forward]
Beginning Balance		100,000
Restructuring Costs	200,000	400,000
Amounts Paid		(500,000)
Ending Balance	0	0		100,000
Profit Improvement Plan | North America Contract
Restructuring Cost and Reserve [Line Items]
Effect on Future Earnings, Amount		10,000,000
Restructuring Costs	100,000	1,700,000
Restructuring and Related Cost, Cost Incurred to Date	9,400,000	9,400,000
Restructuring and Related Cost, Expected Cost Remaining	0	0
Restructuring Reserve [Roll Forward]
Beginning Balance		7,700,000
Restructuring Costs	100,000	1,700,000
Amounts Paid		(7,200,000)
Ending Balance	2,200,000	2,200,000		7,700,000
Profit Improvement Plan | North America Contract | Severance and Employee-Related
Restructuring Reserve [Roll Forward]
Beginning Balance		6,700,000
Amounts Paid		(7,000,000.0)
Ending Balance	1,400,000	1,400,000		6,700,000
Profit Improvement Plan | North America Contract | Exit or Disposal Activities
Restructuring Cost and Reserve [Line Items]
Restructuring Costs		0
Restructuring Reserve [Roll Forward]
Beginning Balance		1,000,000.0
Restructuring Costs		0
Amounts Paid		(200,000)
Ending Balance	800,000	800,000		$ 1,000,000.0
Nemschoff Plan | North America Contract
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	2,600,000
Restructuring Reserve [Roll Forward]
Restructuring Costs	2,600,000
Restructuring and Related Cost, Expected Cost	4,300,000	4,300,000
Restructuring and Related Cost, Expected Cost, Current Year	3,800,000	$ 3,800,000
North American Sales and Global Product Teams Plan [Member] | North America Contract
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	1,400,000
Restructuring Reserve [Roll Forward]
Restructuring Costs	1,400,000
Amounts Paid	$ 200,000