Summary of Unaudited Quarterly Consolidated Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																	12 Months Ended
	May 31, 2016		Feb. 29, 2016		Nov. 30, 2015		Aug. 31, 2015		May 31, 2015		Feb. 28, 2015		Nov. 30, 2014		Aug. 31, 2014		Nov. 30, 2013	May 31, 2016	May 31, 2015	May 31, 2014
Quarterly Financial Information [Line Items]
Net sales	$ 714,671		$ 647,080		$ 699,816		$ 758,147		$ 846,023		$ 804,785		$ 871,012		$ 862,414			$ 2,819,714	$ 3,384,234	$ 3,126,426
Gross margin	134,475		95,923		109,179		113,016		110,312		98,491		125,223		129,507			452,593	463,533	492,519
Impairment of goodwill and long-lived assets					22,962	[1]	3,000	[1]	2,344	[1]	81,600	[1]	14,235	[1]	1,950	[1]	$ 30,734	25,962	100,129	58,246
Net earnings (loss)	62,738	[2]	34,143	[2]	25,752	[2]	34,995	[2]	30,226		(23,243)		31,455		48,820			157,628	87,256	160,152
Net earnings (loss) attributable to controlling interest	$ 58,523	[2]	$ 29,847	[2]	$ 23,376	[2]	$ 31,968	[2]	$ 28,865		$ (25,710)		$ 29,462		$ 44,168			$ 143,715	$ 76,785	$ 151,300
Earnings (loss) per share - basic	$ 0.95	[2]	$ 0.48	[2]	$ 0.37	[2]	$ 0.50	[2]	$ 0.45		$ (0.39)		$ 0.44		$ 0.65			$ 2.30	$ 1.16	$ 2.19
Earnings (loss) per share - diluted	$ 0.92	[2]	$ 0.47	[2]	$ 0.36	[2]	$ 0.48	[2]	$ 0.44		$ (0.39)		$ 0.43		$ 0.63			$ 2.22	$ 1.12	$ 2.11

[1] For additional information regarding the Company's impairment charges, refer to "Note C - Goodwill and Other Long-Lived Assets."

[2] Amounts are presented on a revised basis due to the adoption of amended accounting guidance related to the accounting for share-based payments in the fourth quarter of fiscal 2016. As a result of the adoption of this amended accounting guidance, net earnings and net earnings attributable to controlling interest for the three month periods ended August 31, 2015, November 30, 2015 and February 29, 2016 increased $558,000, $136,000 and $271,000, respectively, from the previously reported results. For additional information, refer to "Note A - Summary of Significant Accounting Policies - Recently Issued Accounting Standards."