Condensed Consolidating Financial Statements (Details) (USD $)	9 Months Ended
	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Current assets:
Cash and cash equivalents	$ 137,559,000	$ 210,521,000	$ 136,049,000	$ 152,051,000
Accounts receivable, net	96,648,000	104,950,000
Inventories, net	221,360,000	212,234,000
Prepaid expenses and other	36,509,000	32,259,000
Deferred income taxes	5,383,000	6,370,000
Total current assets	497,459,000	566,334,000
Property and equipment, net	312,911,000	315,848,000
Goodwill	35,584,000	36,676,000	1,092,000
Intangible assets, net	39,750,000	41,527,000
Restricted cash	26,177,000	2,204,000
Other assets	14,459,000	12,963,000
Total assets	926,340,000	975,552,000
Current liabilities:
Current portion of long-term debt	7,908,000	1,951,000
Accounts payable, trade	61,593,000	74,404,000
Accrued expenses	85,077,000	89,079,000
Income taxes payable	1,104,000	2,256,000
Total current liabilities	155,682,000	167,690,000
Long-term debt, less current portion	375,587,000	345,380,000
Other non-current obligations	86,455,000	101,229,000
Deferred income taxes	4,805,000	2,257,000
Stockholders' equity	303,811,000	358,996,000
Total liabilities and stockholders' equity	926,340,000	975,552,000
Parent
Current assets:
Cash and cash equivalents	8,418,000	7,933,000	6,803,000	6,417,000
Intercompany receivable	287,152,000	251,970,000
Prepaid expenses and other	3,223,000	3,084,000
Total current assets	298,793,000	262,987,000
Property and equipment, net	202,000	20,000
Investments in subsidiaries	437,615,000	454,517,000
Other assets	7,073,000	7,796,000
Long-term intercompany receivable	78,225,000	79,185,000
Total assets	821,908,000	804,505,000
Current liabilities:
Current portion of long-term debt	6,630,000
Accounts payable, trade	35,000	460,000
Intercompany payable	81,288,000	34,830,000
Accrued expenses	26,907,000	30,747,000
Total current liabilities	114,860,000	66,037,000
Long-term debt, less current portion	375,020,000	343,539,000
Other non-current obligations	28,217,000	35,933,000
Stockholders' equity	303,811,000	358,996,000
Total liabilities and stockholders' equity	821,908,000	804,505,000
Guarantor Subsidiaries
Condensed Consolidating Balance Sheet
Percentage of ownership interest	100.00%
Interest rate of senior notes (as a percent)	10.50%
Retained earnings, intercompany receivables and net income understatement amount		27,800,000
Current assets:
Cash and cash equivalents	94,644,000	178,205,000	99,567,000	119,326,000
Accounts receivable, net	38,529,000	42,706,000
Intercompany receivable	185,113,000	55,863,000
Inventories, net	134,225,000	121,611,000
Prepaid expenses and other	12,085,000	13,537,000
Deferred income taxes	883,000	192,000
Total current assets	465,479,000	412,114,000
Property and equipment, net	113,883,000	114,615,000
Investments in subsidiaries	467,565,000	435,970,000
Goodwill	35,584,000	36,676,000
Intangible assets, net	30,546,000	31,630,000
Restricted cash	26,177,000	2,204,000
Other assets	4,102,000	3,956,000
Long-term intercompany receivable	61,481,000	62,235,000
Total assets	1,204,817,000	1,099,400,000
Current liabilities:
Current portion of long-term debt	25,000	25,000
Accounts payable, trade	23,717,000	35,206,000
Intercompany payable	452,953,000	315,906,000
Accrued expenses	17,904,000	23,007,000
Income taxes payable	3,062,000	3,031,000
Total current liabilities	497,661,000	377,175,000
Other non-current obligations	4,669,000	5,400,000
Deferred income taxes	1,045,000	272,000
Long-term intercompany payable	78,225,000	79,185,000
Stockholders' equity	623,217,000	637,368,000
Total liabilities and stockholders' equity	1,204,817,000	1,099,400,000
Non-Guarantor Subsidiaries
Condensed Consolidating Balance Sheet
Percentage of capital stock	51.00%
Current assets:
Cash and cash equivalents	34,497,000	24,383,000	29,679,000	26,308,000
Accounts receivable, net	58,119,000	62,244,000
Intercompany receivable	173,135,000	171,921,000
Inventories, net	87,135,000	90,623,000
Prepaid expenses and other	24,148,000	18,416,000
Deferred income taxes	4,500,000	6,178,000
Total current assets	381,534,000	373,765,000
Property and equipment, net	198,826,000	201,213,000
Investments in subsidiaries	10,683,000	(4,622,000)
Intangible assets, net	9,204,000	9,897,000
Other assets	3,284,000	1,211,000
Long-term intercompany receivable	2,876,000	1,065,000
Total assets	606,407,000	582,529,000
Current liabilities:
Current portion of long-term debt	1,253,000	1,926,000
Accounts payable, trade	37,841,000	39,490,000
Intercompany payable	111,159,000	122,799,000
Accrued expenses	40,266,000	35,325,000
Income taxes payable	989,000	2,003,000
Total current liabilities	191,508,000	201,543,000
Long-term debt, less current portion	567,000	1,841,000
Other non-current obligations	53,569,000	59,896,000
Deferred income taxes	3,760,000	1,985,000
Long-term intercompany payable	64,357,000	63,300,000
Stockholders' equity	292,646,000	253,964,000
Total liabilities and stockholders' equity	606,407,000	582,529,000
Reclassifications and Eliminations
Current assets:
Intercompany receivable	(645,400,000)	(479,754,000)
Prepaid expenses and other	(2,947,000)	(2,778,000)
Total current assets	(648,347,000)	(482,532,000)
Investments in subsidiaries	(915,863,000)	(885,865,000)
Long-term intercompany receivable	(142,582,000)	(142,485,000)
Total assets	(1,706,792,000)	(1,510,882,000)
Current liabilities:
Accounts payable, trade		(752,000)
Intercompany payable	(645,400,000)	(473,535,000)
Income taxes payable	(2,947,000)	(2,778,000)
Total current liabilities	(648,347,000)	(477,065,000)
Long-term intercompany payable	(142,582,000)	(142,485,000)
Stockholders' equity	(915,863,000)	(891,332,000)
Total liabilities and stockholders' equity	$ (1,706,792,000)	$ (1,510,882,000)