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Summary By Business Segment (Financial Information By Segment) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 23 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Segment Reporting Information [Line Items]          
Gas and rent $ 721,455 $ 660,603 $ 2,203,272 $ 2,015,084  
Hardgoods 432,296 373,861 1,301,862 1,133,699  
Total net sales 1,153,751 1,034,464 3,505,134 3,148,783  
Cost of products sold (excluding depreciation) 520,816 458,217 1,604,177 1,409,491  
Selling, distribution and administrative expenses 433,050 387,962 1,279,933 1,175,125  
Restructuring and other special charges 2,431 0 18,261 0  
Costs (benefits) related to unsolicited takeover attempt (1,170) 17,558 (7,870) 26,032 60,000
Depreciation 61,575 56,131 182,224 166,610  
Amortization 6,437 6,230 18,841 18,643  
Operating income 130,612 108,366 409,568 352,882  
Distribution [Member]
         
Segment Reporting Information [Line Items]          
Gas and rent 611,005 564,134 1,827,302 1,683,551  
Hardgoods 430,724 372,570 1,297,343 1,129,278  
Total net sales 1,041,729 936,704 3,124,645 2,812,829  
Cost of products sold (excluding depreciation) 467,999 411,057 1,414,059 1,245,419  
Selling, distribution and administrative expenses 379,894 352,238 1,131,263 1,059,037  
Restructuring and other special charges 0 0 0 0  
Costs (benefits) related to unsolicited takeover attempt 0 0 0 0  
Depreciation 56,695 52,249 168,026 155,169  
Amortization 5,171 5,069 15,075 15,158  
Operating income 131,970 116,091 396,222 338,046  
All Other Operations [Member]
         
Segment Reporting Information [Line Items]          
Gas and rent 119,409 104,277 404,554 354,969  
Hardgoods 1,578 1,298 4,533 4,439  
Total net sales 120,987 105,575 409,087 359,408  
Cost of products sold (excluding depreciation) 61,782 54,975 218,716 187,526  
Selling, distribution and administrative expenses 40,002 33,653 120,258 100,070  
Restructuring and other special charges 0 0 0 0  
Costs (benefits) related to unsolicited takeover attempt 0 0 0 0  
Depreciation 4,880 3,882 14,198 11,441  
Amortization 1,266 1,161 3,766 3,485  
Operating income 13,057 11,904 52,149 56,886  
Eliminations And Other [Member]
         
Segment Reporting Information [Line Items]          
Gas and rent (8,959) (7,808) (28,584) (23,436)  
Hardgoods (6) (7) (14) (18)  
Total net sales (8,965) (7,815) (28,598) (23,454)  
Cost of products sold (excluding depreciation) (8,965) (7,815) (28,598) (23,454)  
Selling, distribution and administrative expenses 13,154 2,071 28,412 16,018  
Restructuring and other special charges 2,431 0 18,261 0  
Costs (benefits) related to unsolicited takeover attempt (1,170) 17,558 (7,870) 26,032  
Depreciation 0 0 0 0  
Amortization 0 0 0 0  
Operating income $ (14,415) $ (19,629) $ (38,803) $ (42,050)