Schedule of Consideration Transferred and the Priliminary Fair Value Assigned to Assets Acquired And Liabilities Assumed (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Nov. 30, 2017	Nov. 30, 2017	May 31, 2017
Estimated Fair Value of Assets Acquired and Liabilities Assumed:
Goodwill	$ 350,117	$ 350,117	$ 247,673
AMTROL
Estimated Fair Value of Assets Acquired and Liabilities Assumed:
Cash	6,893	6,893
Accounts receivable	40,212	40,212
Inventories	37,249	37,249
Prepaid expenses	981	981
Other assets	2,550	2,550
Intangible assets	166,000	166,000
Property, plant and equipment	52,870	52,870
Total assets	306,755	306,755
Accounts payable	25,945	25,945
Accrued liabilities	21,016	21,016
Long-term debt including current maturities	2,287	2,287
Other accrued items	3,993	3,993
Deferred income taxes, net	64,082	64,082
Net identifiable assets	189,432	189,432
Goodwill	102,489	102,489
Purchase price	291,921	291,921
Less: excess working capital	(523)	(523)
Cash paid at closing		291,398
AMTROL | Preliminary
Estimated Fair Value of Assets Acquired and Liabilities Assumed:
Cash	6,893	6,893
Accounts receivable	40,212	40,212
Inventories	37,249	37,249
Prepaid expenses	981	981
Other assets	2,550	2,550
Intangible assets	166,000	166,000
Property, plant and equipment	52,870	52,870
Total assets	306,755	306,755
Accounts payable	25,945	25,945
Accrued liabilities	21,016	21,016
Long-term debt including current maturities	2,287	2,287
Other accrued items	3,993	3,993
Deferred income taxes, net	64,495	64,495
Net identifiable assets	189,019	189,019
Goodwill	102,902	102,902
Purchase price		291,921
Less: excess working capital	(523)	(523)
Cash paid at closing		291,398
AMTROL | Measurement Period Adjustments
Estimated Fair Value of Assets Acquired and Liabilities Assumed:
Deferred income taxes, net	(413)	(413)
Net identifiable assets	413	413
Goodwill	$ (413)	$ (413)