Earnings per share - Schedule of Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2024	Aug. 31, 2023	Aug. 31, 2024	Aug. 31, 2023
Earnings Per Share [Abstract]
Net income	$ 28,464	$ 19,098	$ 67,291	$ 54,862
Weighted average shares outstanding (in shares)	42,872	43,452	43,296	43,365
Basic earnings per common share (in dollars per share)	$ 0.66	$ 0.44	$ 1.55	$ 1.27
Diluted earnings per common share:
Net income	$ 28,464	$ 19,098	$ 67,291	$ 54,862
Weighted average shares outstanding (in shares)	42,872	43,452	43,296	43,365
Effect of dilution from common stock equivalents (in shares)	839	1,353	871	1,178
Effect of dilution from if-converted 2026 Notes (in shares)	0	176	0	0
Diluted weighted average shares outstanding (in shares)	43,711	44,981	44,167	44,543
Diluted earnings per share (in dollars shares)	$ 0.65	$ 0.42	$ 1.52	$ 1.23