Acquisitions and divestiture - Narrative (Details) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2017 USD ($) acquisition	Mar. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Number of businesses acquired | acquisition				3
Increase (decrease) in pro forma net income attributable to common shareholders	$ 238,673		$ 187,084	$ 690,107	$ 565,044
Gain on disposal		$ 45,000
Fair Value Adjustments and Transaction, Operating and Acquisition Costs
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Increase (decrease) in pro forma net income attributable to common shareholders				$ 72,006		$ (29,106)
CLARCOR, Inc
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Equity interest (as a percent)	100.00%			100.00%
Purchase price, cash payments				$ 4,110,000
Aggregate annual sales for businesses acquired for their most recent fiscal year prior to acquisition				1,400,000
Net sales, from date of acquisition				135,986
Operating loss, from date of acquisition				$ (13,582)