Earnings per share - Computation of basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	[1],[2],[3],[4],[5],[6],[7]	Dec. 31, 2021	Dec. 31, 2020	[1],[2],[3],[4],[5],[6],[7]
Numerator:
Net income attributable to common shareholders, basic	$ 387,600	$ 448,351		$ 838,757	$ 768,154
Net income attributable to common shareholders, diluted	$ 387,600	$ 448,351		$ 838,757	$ 768,154
Denominator:
Basic - weighted average common shares (in shares)	128,493,725	129,013,781		128,610,223	128,860,763
Increase in weighted average common shares from dilutive effect of equity-based awards (in shares)	2,087,940	2,061,874		1,974,989	1,621,801
Diluted - weighted average common shares, assuming exercise of equity-based awards (in shares)	130,581,665	131,075,655		130,585,212	130,482,564
Basic earnings per share (in USD per share)	$ 3.02	$ 3.48		$ 6.52	$ 5.96
Diluted earnings per share (in USD per share)	$ 2.97	$ 3.42		$ 6.42	$ 5.89

[1] *Prior period has been adjusted to reflect the change in inventory accounting method, as described in the Company's fiscal 2021 Annual Report on Form 10-K.

[2] *Prior period has been adjusted to reflect the change in inventory accounting method, as described in the Company's fiscal 2021 Annual Report on Form 10-K.

[3] *Prior period has been adjusted to reflect the change in inventory accounting method, as described in the Company's fiscal 2021 Annual Report on Form 10-K.

[4] *Prior period has been adjusted to reflect the change in inventory accounting method, as described in the Company's fiscal 2021 Annual Report on Form 10-K.

[5] *Prior period has been adjusted to reflect the change in inventory accounting method, as described in the Company's fiscal 2021 Annual Report on Form 10-K.

[6] *Prior period has been adjusted to reflect the change in inventory accounting method, as described in the Company's fiscal 2021 Annual Report on Form 10-K.

[7] *Prior period has been adjusted to reflect the change in inventory accounting method, as described in the Company's fiscal 2021 Annual Report on Form 10-K.