Business Segments, Concentration of Business, and Credit Risk and Significant Customers (Wholesale Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2014
Business segment information
Net sales to external customers	$ 784,678	$ 736,048	$ 1,476,420	$ 1,292,858
Income (loss) from operations	214,581	201,499	223,682	205,245
Total assets for reportable segments	1,416,841		1,416,841		1,064,204
Reportable segments
Business segment information
Total assets for reportable segments	826,373		826,373		654,679
UGG wholesale
Business segment information
Net sales to external customers	401,702	399,628	815,694	735,671
Income (loss) from operations	135,893	128,909	261,614	210,655
Total assets for reportable segments	334,860		334,860		153,341
Teva wholesale
Business segment information
Net sales to external customers	12,373	14,189	65,641	58,830
Income (loss) from operations	(660)	(1,258)	3,812	(475)
Total assets for reportable segments	45,661		45,661		81,766
Sanuk wholesale
Business segment information
Net sales to external customers	17,763	19,974	66,047	64,409
Income (loss) from operations	(282)	1,085	9,307	11,231
Total assets for reportable segments	208,277		208,277		214,627
Other wholesale
Business segment information
Net sales to external customers	13,211	6,936	47,153	27,907
Income (loss) from operations	(4,522)	(4,549)	(9,104)	(7,227)
Total assets for reportable segments	53,625		53,625		41,281
eCommerce
Business segment information
Net sales to external customers	146,871	117,300	183,902	142,920
Income (loss) from operations	67,006	53,536	75,256	57,883
Total assets for reportable segments	10,697		10,697		3,129
Retail stores
Business segment information
Net sales to external customers	192,758	178,021	297,983	263,121
Income (loss) from operations	74,302	67,328	51,979	55,250
Total assets for reportable segments	173,253		173,253		160,535
Unallocated to Segments
Business segment information
Income (loss) from operations	$ (57,156)	$ (43,552)	$ (169,182)	$ (122,072)