Note 14. Segment and Geographic Information (Detail) - Sales by Geographic Segment (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended	9 Months Ended
	Feb. 29, 2012	Aug. 19, 2011	Feb. 28, 2011	Feb. 29, 2012	Feb. 28, 2011	May 31, 2011
Sales:
Net Sales	$ 81,370	$ 74,910	$ 83,349	$ 175,795	$ 248,536
Income (loss) from operations	9,113	(6,508)	33,867	(16,152)	98,026
Goodwill	960,219			960,219		93,767
Intangible assets	749,367			749,367		54,133
Total assets at period end	1,958,711			1,958,711		633,127
Europe [Member] | Total [Member]
Sales:
Net Sales	21,258	19,092	19,311	46,501	61,334
Europe [Member] | Affiliates [Member]
Sales:
Net Sales	4,508	3,992	3,313	8,808	11,833
Europe [Member] | Unaffiliated Customers [Member]
Sales:
Net Sales	16,750	15,100	15,998	37,693	49,501
Europe [Member]
Sales:
Income (loss) from operations	1,393	1,619	3,213	336	8,857
Goodwill	152,657	7,239	6,993	152,657	6,993
Intangible assets	45,292	1,139	1,197	45,292	1,197
Total assets at period end	273,920	92,440	86,162	273,920	86,162
Other Geographic Area [Member] | Total [Member]
Sales:
Net Sales	8,696	7,556	7,515	18,307	22,878
Other Geographic Area [Member] | Affiliates [Member]
Sales:
Net Sales	83	110	39	207	209
Other Geographic Area [Member] | Unaffiliated Customers [Member]
Sales:
Net Sales	8,613	7,446	7,476	18,100	22,669
Other Geographic Area [Member]
Sales:
Income (loss) from operations	2,470	2,171	2,543	2,929	8,327
Goodwill	111,835	15,880	15,511	111,835	15,511
Intangible assets	43,178	6,592	6,193	43,178	6,193
Total assets at period end	174,893	39,199	61,567	174,893	61,567
United States [Member] | Total [Member]
Sales:
Net Sales	59,742	56,043	63,715	128,164	188,148
United States [Member] | Affiliates [Member]
Sales:
Net Sales	3,735	3,679	3,840	8,162	11,782
United States [Member] | Unaffiliated Customers [Member]
Sales:
Net Sales	56,007	52,364	59,875	120,002	176,366
United States [Member]
Sales:
Income (loss) from operations	5,250	(10,298)	28,111	(19,417)	80,842
Goodwill	695,727	70,946	73,881	695,727	73,881
Intangible assets	660,897	45,871	47,679	660,897	47,679
Total assets at period end	2,001,009	732,603	657,440	2,001,009	657,440
Geographical Intersegment, Eliminations [Member] | Total [Member]
Sales:
Net Sales	(8,326)	(7,781)	(7,192)	(17,177)	(23,824)
Geographical Intersegment, Eliminations [Member] | Affiliates [Member]
Sales:
Net Sales	(8,326)	(7,781)	(7,192)	(17,177)	(23,824)
Geographical Intersegment, Eliminations [Member]
Sales:
Total assets at period end	(491,111)	(211,847)	(207,861)	(491,111)	(207,861)
Consolidated [Member] | Total [Member]
Sales:
Net Sales	81,370	74,910	83,349	175,795	248,536
Consolidated [Member] | Unaffiliated Customers [Member]
Sales:
Net Sales	81,370	74,910	83,349	175,795	248,536
Consolidated [Member]
Sales:
Income (loss) from operations	9,113	(6,508)	33,867	(16,152)	98,026
Goodwill	960,219	94,065	96,385	960,219	96,385
Intangible assets	749,367	53,602	55,069	749,367	55,069
Total assets at period end	$ 1,958,711	$ 652,395	$ 597,308	$ 1,958,711	$ 597,308