Acquisitions and divestiture - Schedule of assets and liabilities assumed on acquisition date (Details) - CLARCOR, Inc $ in Thousands	Feb. 28, 2017 USD ($)
Assets:
Cash and cash equivalents	$ 145,491
Accounts receivable	249,045
Inventories	278,060
Prepaid expenses	13,903
Plant and equipment	373,698
Deferred income taxes	4,558
Other assets	8,367
Intangible assets	1,497,280
Goodwill	2,649,456
Assets acquired	5,219,858
Liabilities:
Notes payable	20,162
Accounts payable, trade	82,436
Accrued payrolls and other compensation	42,653
Accrued domestic and foreign taxes	4,379
Other accrued liabilities	79,066
Long-term debt	288,336
Pensions and other postretirement benefits	33,928
Deferred income taxes	542,698
Other liabilities	13,878
Noncontrolling interests	1,843
Liabilities acquired, including noncontrolling interest	1,109,379
Net assets acquired	$ 4,110,479